Is it bursitis? Hurts like He!!, but PT will usually fix it. I had it years ago, went to the Dr and he told me to move the shoulder every chance I got.
I looked at him like he was nuts, then asked had he ever had bursitis? He said no. If he'd ever had it, he wouldn't have told me to move the shoulder.
However, I took his advice and some anti-inflamatories and was fine in a week. Sounds like I was very lucky!