Hi, I injured my left shoulder over five months ago, and now all the muscles on the upper back are stuck in spasm and won’t let go, no matter how much I stretch it or exercise it. I don’t have any pain, and no problem sleeping. However when I try to raise my arm above my head, the muscles (particularly the Latissimus Dorsi) tighten and ‘pull’ the arm back down.
Anybody else experience something like this?