Fibromyalgia is a neuroendocrine disorder and is a syndrome related to Chronic Fatigue (aka Myalgic Encephalomyelitis), the main difference being that there is a greater degree of muscle pain in fibromyalgia than in CFS/ME.
My best guess is that it caused by cortisol damage to the hippocampus during traumas that subsequently affect the pineal and hpa axis.
Polymagia rheumatica may exist in conjunction with fibromyalgia, but fibro carries with it a great host of other symptoms, including brain chemistry imbalances, hormonal disturbances and digestive problems. The two problems are not really related as far as I'm aware. Polymagia can be cured, from what I understand.
There is no cure of fibromyalgia, but there are some good treatments. I have been battling the f'n' shit for over a year and found the best results with homeopathy through a company called Custom Homeopathics. As a matter of fact, I am one of their guinea pigs and my journal of my experiences using their protocol is documented at their website. I started in February and was into remission by June and continue to do pretty well. I have returned to a normal life, normal function, and I am starting to lift a little weight again, even. I'm still not very strong in the ligaments and muscle insertions (where fibro hits hardest) - so I'm not too good with free weights. Need to renew my gym membership so I can get on machines again.
Custom Homeopathics website is
http://www.customhps.com - and no I don't get money, just good karma - they are basically non-profit, anyway.
I don't think the two are much related at all. I'm not sure I'd want to take prednisone, but if that's the cure - well - what else can you do?
Fawn