Could fibro concentrate just in the upper shoulders and the mid back?

Not likely. Fibromyalgia pain is typically more diffuse and symetric. Meaning equally on both sides of the body. If it is just your shoulders/upper back areas are involved, it is more likely to be muscle strain etc...It can be relatively determined by a physical exam from your doc...
Yes. Three of the commonest trigger points arein the mid back 6of them the diagnosis of fibro requires more rhan 6 trigger pts.