Fibromyalgia is under the umbrella of the Arthritis Foundation.
Here's a link to about.com connecting hormones and fibromyalgia http://arthritis.about.com/cs/fms/a/fmscause_2.htm

I think natural hormones are the way to go, if you can...but that article talks about low cortisol levels....

I don't have fibromyalgia, but do have chronic pain and stress disorders. My cortisol levels are quite low. However, I recently read that, though cortisol levels might be below "normal" in pain patients, they are still "too high" for some people who are hypersensitive to cortisol. Can't recall where I was reading though.

Feel better soon.