However, if it's as though you're back just won't clear up with no other explaination, you may want to look into myalfacial pain syndrome which tends to be upper back, with trigger points
, and is more limited a set of symptoms
than FM. (Not that's it's not sometimes extremely painful and incapacitating.) I'm not spelling it right. There's a book that comes with a tool, a stick with knobs on the end, to push the points yourself that someone told me was a god send.