Personally, I can't answer your two questions separately. In my case, the emotional component DIRECTLY impacted my physical symptoms.
I'm going to sound like a broken record, so some of you may want to stop reading now...
I tried taking supplements (after discussions with my GP) and found little to no benefit. I have become very aware that taking supplements may help with one symptom/problem, however other problems tend to crop up. This has only been my experience. I now take a very balanced approach. For my meals I try my best to eat the recommended portions (starch, fruits/vegetables, protein, milk, fats/oils) from the Canadian Food Guideline. I also exercise daily in which I incorporate aerobic & weight-training. Fortunately I have never had problems sleeping & always get 8-9 hrs a night. I do take a multi-vitamin daily.
The most important aspect (and the most difficult) to controlling this condition, in my case, was mentally. I was very fortunate to have a fantastic GP & Neuro. Their reassurances really helped.
I did however still have doubts. I was able to understand that I trusted my Doctors & believed them, but I was still really worried. I did a lot of reflecting over several months & realized that I was obsessing over this condition but more importantly that I was being selfish, I was only thinking of myself. I realized just how lucky I was. A great wife, two wonderful kids, a supportive family, a good job, roof over our heads & groceries in the fridge. I really look at things differently now. I have much to be thankful for - just getting out of bed in the morning & being able to walk - look at Christopher Reeves.
I no longer focus on my twitching and muscle aches. I have resigned myself that I have this & it will most likely be a part of my life forever, albeit a small one - that's my choice. Once I realized this and started focusing my energy into fostering relationships with the people who really mattered to me, the other stuff didn't or hasn't bothered me nearly as much.
There are many times on this BB that I make sarcastic comments. My intention is not to start fights but to downplay this benign condition. If you have been diagnosed with BFS, be thankful, it could be a whole lot worse. Find out what is really important to you & focus your energy in that direction - BFS just isn't worth it!
Good luck to all of you.
Dale