My sister thinks she has Fibromyalgia now. Have you been to a nutritionist yet, and have you had an Organic Acids test, IgG antibody test, or Gastrointestinal profile test? My nutritionist works with fibromyalgia patients. Have you tried digestive enzymes, especially protease enzymes?
There's much that you can do to relieve the pain from this condition. I'm not very knowledgeable about the particulars, but if you find a nutritionist to do these tests for you, you may find out what's causing your condition.
A good digestive enzyme complex is an inexpensive place to start.
Also, acidophilus and bifidus, the "good" bacterias.
Hope this helps.