I dont have Fibro, but it was initially assumed I did (or else MS) as my symptoms - fatigue, tingling, back ache, nerve pain, numbness, headaches were not obviously hormonal. Had lots of tests, scans etc all of which revealed nothing. It wasnt until a year or so later that a neurologist suggested I had my hormone levels taken and that's when it was found I had very low estrogen (fsh was normal). I wasted over a year taking drugs meant for Fibro when in fact it was something totally different that my body needed.
Since then, I have been told that estrogen affects over 250 different functions/parts of our bodies - yet still, many doctors only seem to recognise the more common symptoms like flushes and dryness.