Could this be CFS (Chronic Fatigue Syndrome).

It's a neurological disorder that is viral based. It can cause any number of issues including fibromyalgia.

There's a great doc at Stanford University doing great work with this. If you go to youtube and put in stanford univ and chronic fatigue syndrome you can view a couple of videos that he's has done, one is an hour long presentation he's giving to other MD's...it's very interesting...you might look into it,,,can't hurt..

I hope you figure this out...hang in there..