I have not have fibromyalgia, but I have Celiac Disease (gluten intolerance). Many people that have Celiac also have fibromyalgia, and/or Dermatitis Herpetiformis.
http://www.celiac.com/st_prod.html?p...5106128799.e4:)

Other possible food causes:
http://www.fmaware.org/fmOnlineNewsl...ticle_food.htm

Good luck.