Many people here theorize that there is an unknown (or known) viral infection causing BFS. I dont know if its relevant, but I was diagnosed with acute cytomegalovirus infection last week, which is a herpes virus, which is in active stage right now. Both my IGG and IGM are high. CMV rarely causes symptoms, but for those who have never had it before, and get it later in life (nearing 40) it can cause mononucleosis syndrome which can wax and wane for months.I ran across this post on another site, describing my symptoms verbatim, as well as the CMV diagnosis, right down to the left foot, calf, and eyelid: My doc saw that and said lets give viral suppression a try.The more I read about viral infections (especially those in the herpes family), the more akin it sounds to a BFS behavior. References to malfunctioning stress control, jacked up cortisol levels, adrenal fatigue all being tied to the viral syndrome. All heavily discussed here as symptom management techniques. The fact that it can go dormant and reactivate with poor lifestyle choices or stress. For me, it may be CMV. For others it may be something else. Or a virus yet to be identified.My doctor just prescribed me some Valtrex. Since EBF and CMV (and by the way there is also others like HHV6 and Papovirus) are all part of the herpes virus family, he's hoping the Valtrex may help suppress it long enough for my immune system to win the battle. So im going to start on it tomorrow. Get this - Valtrex is not targeted for CMV ... but there are anecdotal reports that it can help. The real medication that stops this form of the herpes virus .. is Valganciclovir. Unfortunately that stuff has a black box label warning that is causes cancer in humans. However a ton of people take it quite often for Fibromyalgia and Chronic Fatigue Syndrome. Its becoming more and more common - and apparently there is a 75% cure rate by using it. Now how about that?Valganciclovir .... which is nothing more than an antiviral medication. Stops replication of viruses. Helps reverse Fibromyalgia and Chronic Fatigue Syndrome in 75% of cases? And BFS symptoms are so unbelievably similar to Fibromyalgia its scary. Maybe the Valganciclovir addresses more than Cytomegalovirus. Some other viruses. Last night I spoke to the guy who developed sarcoidosis after the HIV meds, he said he just got off the phone with a lady who also took them .... and was miserable for 3 years ... positive for CMV .... (HIV meds can reactivate a latent CMV infection) was told she had fibromyalgia .... and took the Valganciclovir and she said her life was turned upside down, in a good way. Never in her life felt so energetic and incredible. She was raving. Valtrex only has something like a 30% chance it can limit CMV .... but i figure my goal right now is to empower my immune system. Im on Lysine and other herpes inhibiting supplements .... valtrex can only help. I will update this thread if something crazy happens and all the twitching stops while im on it. 99% sure it wont. But hey ... im proud to be your guinea pig. Oink!