This is a follow-up of my posting on what worked for me as a subset of those with BFS or PNH like myself. For those inclined to researching the medical reasons why PNH is a comglomerate of symptoms for your condition, consider the following. Please don't be intimidated by going to: The National Library of Medicine and the National Institutes of Health :
PubMed:
Consider these:
1) Hypothyroidism Presenting With Musculoskeletal Symptoms by D. N. Golding, Ann. Rhem Dis (1970), 29, 10 (full pdf available)
2) Neuromuscular Findings in Thyroid Dysfunction: A Prospective Clinical and Electrodiagnostic Study by Ruurd F Duyff, et al, J Neurol Neurosurg Psychiatry 2000; 68: 750-755 (full pdf available)
(note: problem with both hyperthyroidism and hypothyroidism)
3) Neuromuscular Hyperexcitability Features in Patients Suffering from Musculoskeletal Pain: a Neuroepidemiologic Survey by P H Jansen, et al, Funct Neurol. 1992 Jan-Feb; 7 (1): 31-4 (abstract only)
4) Evidence of Neuromuscular Hyperexcitability in Patients with Primary Fibromyalgia by C Vitali, et al, Clin Exp Rheumatol 1989 Jul-Aug; 7 (4): 385-90 (abstract only)
5) Evaluation of the Patient with Muscle Weakness by Aaron Saguil, et al, American Family Physician, April 1, 2005, Vol 71, Number 7
( full pdf available)
6) Reversible Subclinical Hypothyroidism in the Presence of Adrenal Insufficiency by Hussein D. Abdullatif, MD, Endocrine Practice Vol 12, No. 5 Sept/Oct 2006 (full pdf available)
7) Autosomal-Dominant Non-Autoimmune Hyperthyroidism Presenting with Neuromuscular Systems by Aziz Elgadi, Acta Paediatrica, Vol 94, No. 8/Aug 2005 (abstract only)
The Treatment of Myotonia: Evaluation of Chronic Oral Taurine Therapy by Luca Durelli, MD, Neurology 1983; 33: 599 (abstract only)
(note: L-taurine is a non-essential amino acid (protein) for humans but may be helpful: this is one that I'm trying on my one as well as both pyridoxine (vit B6) and thiamine (vit B1) at 100 mg or less per day and am considering the amino acid, glycine; use of alpha-lipoic acid is the best way to increase glutathione as the best antioxidant in the human body; acetyl-L-carnitine is another nutrient to consider, as well as the omega-3 fatty acids - DHA and EPA; resveratrol is another as a polyphenol with great possibilities in the future)
9) Muscle Carnitine in Hypo- and Hyperthyroidism by C. Sinclair, et al, Muscle Nerve. 2005 Sept; 32 (3): 357-9 (abstract only)
10) The Immune System as a Regulator of the Thyroid Hormone Activity: Minireview by John R. Klein, 2006 Society for Experimental Biology and Medicine ( thought to be available as full pdf)
11) A Metabolic Basis for Fibromyalgia and Its Related Disorders: the Possible Role of Resistance to Thyroid Hormone by R. L. Garrison, P.C. Breeding, Medical Hypothesis (2003) 61 (2), 182-189 (abstract only but applicable to PNH and very thought provoking)
12) Regulation of the Hypothalamic-Pituitary-Adrenal Axis by Cytokines: Actions and Mechanisms of Action by Andrew V. Turnbull and Catherine L. Rivier, Physiological Reviews, Vol 79, No. 1, Jan. 1999, pp. 1-77 ( full pdf available)
13) Dissociation Between Reactivity of the Hypothalamus-Piuitary-Adrenal Axis and the Sympathetic-Adrenal-Medullary System to Repeated Psychosocial Stress by Nicole C. Schommer, et al, Psychosom Med. 2003 May-Jun; 65 (3): 450-60 (full pdf available)
14) Exhaustion is Associated with Reduced Habituation of Free Cortisol Responses to Repeated Acute Psychosocial Stress by Biol Psychol 2006 May; 72 (2): 147-53 (abstract only)
15) Allostatic Load, Perceived Stress, and Health: a Prospective Study in Two Age Groups by J Hellhammer, et al, Ann N Y Acad Aci. 2004 Dec; 1032; 8-13 (abstract only unless a member of the New York Academy of Sciences; subscription USD$95/year and best place for me to get thorough up-to-date information)
16) Hypothalamic-Pituitary-Adrenal Axis Function in Sjogren's Syndrome: Mechanisms of Neuroendocrine and Immune System Homeostasis by Elizabeth O. Johnson, et al, Ann. N. Y. Acad. Sci. 2006, 1088: 41-51 (abstract only unless member, applicable to BFS and PNH conditions)
17) Corticotrope Hypersecretion Coupled With Cortical Hypo-Responsiveness to Stimuli is Present in Patients With Autoimmune Endocrine Diseases: Evidence for Subclinical Primary Hypoadrenalism? by Roberta Giordano, et al, European Journal of Endocrinology, Vol 155, Issue 3, 421-428 2006 (full pdf available)
This is only a beginning of any good research relating to situations with low-grade hypocortisolism - low-grade hypothyroidism - benign fasciculation (cramp) syndrome - neuromyotonia - peripheral nerve hyperexcitability - fibromyalgia - chronic fatigue syndrome - myalgic encephalomyelitis (for me, they are all related; they are on a continuum and as part of aggregate broad syndrome relating to cortisol, thyroid, serotonin, potassium channelopathies, potassium - calcium - magnesium - pyridoxine - thiamine - B12 - selenium - copper - vitamin E - immune upregulation- disregulation, pro-imflammatory and anti-imflammatory cytokines, leukotrienes, Th1 (T helper 1 cells), Th2, and Th0 cells; to name a few, the list goes on and one)
Sorry about this for going on and on. Do check from my first post on what actually has worked for me: the hormones - Cortef (cortisol) and T4/T3 (thyroid) medication.
PubMed:
Consider these:
1) Hypothyroidism Presenting With Musculoskeletal Symptoms by D. N. Golding, Ann. Rhem Dis (1970), 29, 10 (full pdf available)
2) Neuromuscular Findings in Thyroid Dysfunction: A Prospective Clinical and Electrodiagnostic Study by Ruurd F Duyff, et al, J Neurol Neurosurg Psychiatry 2000; 68: 750-755 (full pdf available)
(note: problem with both hyperthyroidism and hypothyroidism)
3) Neuromuscular Hyperexcitability Features in Patients Suffering from Musculoskeletal Pain: a Neuroepidemiologic Survey by P H Jansen, et al, Funct Neurol. 1992 Jan-Feb; 7 (1): 31-4 (abstract only)
4) Evidence of Neuromuscular Hyperexcitability in Patients with Primary Fibromyalgia by C Vitali, et al, Clin Exp Rheumatol 1989 Jul-Aug; 7 (4): 385-90 (abstract only)
5) Evaluation of the Patient with Muscle Weakness by Aaron Saguil, et al, American Family Physician, April 1, 2005, Vol 71, Number 7
( full pdf available)
6) Reversible Subclinical Hypothyroidism in the Presence of Adrenal Insufficiency by Hussein D. Abdullatif, MD, Endocrine Practice Vol 12, No. 5 Sept/Oct 2006 (full pdf available)
7) Autosomal-Dominant Non-Autoimmune Hyperthyroidism Presenting with Neuromuscular Systems by Aziz Elgadi, Acta Paediatrica, Vol 94, No. 8/Aug 2005 (abstract only)

(note: L-taurine is a non-essential amino acid (protein) for humans but may be helpful: this is one that I'm trying on my one as well as both pyridoxine (vit B6) and thiamine (vit B1) at 100 mg or less per day and am considering the amino acid, glycine; use of alpha-lipoic acid is the best way to increase glutathione as the best antioxidant in the human body; acetyl-L-carnitine is another nutrient to consider, as well as the omega-3 fatty acids - DHA and EPA; resveratrol is another as a polyphenol with great possibilities in the future)
9) Muscle Carnitine in Hypo- and Hyperthyroidism by C. Sinclair, et al, Muscle Nerve. 2005 Sept; 32 (3): 357-9 (abstract only)
10) The Immune System as a Regulator of the Thyroid Hormone Activity: Minireview by John R. Klein, 2006 Society for Experimental Biology and Medicine ( thought to be available as full pdf)
11) A Metabolic Basis for Fibromyalgia and Its Related Disorders: the Possible Role of Resistance to Thyroid Hormone by R. L. Garrison, P.C. Breeding, Medical Hypothesis (2003) 61 (2), 182-189 (abstract only but applicable to PNH and very thought provoking)
12) Regulation of the Hypothalamic-Pituitary-Adrenal Axis by Cytokines: Actions and Mechanisms of Action by Andrew V. Turnbull and Catherine L. Rivier, Physiological Reviews, Vol 79, No. 1, Jan. 1999, pp. 1-77 ( full pdf available)
13) Dissociation Between Reactivity of the Hypothalamus-Piuitary-Adrenal Axis and the Sympathetic-Adrenal-Medullary System to Repeated Psychosocial Stress by Nicole C. Schommer, et al, Psychosom Med. 2003 May-Jun; 65 (3): 450-60 (full pdf available)
14) Exhaustion is Associated with Reduced Habituation of Free Cortisol Responses to Repeated Acute Psychosocial Stress by Biol Psychol 2006 May; 72 (2): 147-53 (abstract only)
15) Allostatic Load, Perceived Stress, and Health: a Prospective Study in Two Age Groups by J Hellhammer, et al, Ann N Y Acad Aci. 2004 Dec; 1032; 8-13 (abstract only unless a member of the New York Academy of Sciences; subscription USD$95/year and best place for me to get thorough up-to-date information)
16) Hypothalamic-Pituitary-Adrenal Axis Function in Sjogren's Syndrome: Mechanisms of Neuroendocrine and Immune System Homeostasis by Elizabeth O. Johnson, et al, Ann. N. Y. Acad. Sci. 2006, 1088: 41-51 (abstract only unless member, applicable to BFS and PNH conditions)
17) Corticotrope Hypersecretion Coupled With Cortical Hypo-Responsiveness to Stimuli is Present in Patients With Autoimmune Endocrine Diseases: Evidence for Subclinical Primary Hypoadrenalism? by Roberta Giordano, et al, European Journal of Endocrinology, Vol 155, Issue 3, 421-428 2006 (full pdf available)
This is only a beginning of any good research relating to situations with low-grade hypocortisolism - low-grade hypothyroidism - benign fasciculation (cramp) syndrome - neuromyotonia - peripheral nerve hyperexcitability - fibromyalgia - chronic fatigue syndrome - myalgic encephalomyelitis (for me, they are all related; they are on a continuum and as part of aggregate broad syndrome relating to cortisol, thyroid, serotonin, potassium channelopathies, potassium - calcium - magnesium - pyridoxine - thiamine - B12 - selenium - copper - vitamin E - immune upregulation- disregulation, pro-imflammatory and anti-imflammatory cytokines, leukotrienes, Th1 (T helper 1 cells), Th2, and Th0 cells; to name a few, the list goes on and one)
Sorry about this for going on and on. Do check from my first post on what actually has worked for me: the hormones - Cortef (cortisol) and T4/T3 (thyroid) medication.