I used the GAPS diet to heal from Fibromyalgia after battling with it for nearly two decades. I have been posting on Healing Rebel
http://www.healingrebel.com about the past 5 years which I have spent experimenting with GAPS, supplements and herbs to find what brings and relieves FM symptoms. Sarah is absolutely right in stating that the disease is of gastrointestinal origin and is reversible.
There is an interesting thread on Inspire about the origins and treatment of Fibromyalgia. Here is the link to that:
http://www.inspire.com/groups/fibromyalgia/discussion/the-fibro-puzzle/
