Fibromyalgia essentially means that your muscles hurt too much, you have too much fatigue, you don't sleep well, you run out of gas and start hurting doing what many others consider normal activity, you have very poor stress tolerance, and your nerves feel wound up like a cat on a hot tin roof. Your ability to exercise and get a good response to exercise is typically impaired and the less exercise you do the worse you tend to feel (a nasty catch 22).

Fibromyalgia is usually triggered by some form of overload. This could be an accident, injury (especially whiplash car injury), illness, acute trauma, prolonged ongoing stress, ...