Have you ever received a cortisone injection for this? Back when my shoulder was in such a state that I couldn't life my arm, a cortisone injection cleared it up within a couple of days. Following that, my shoulder still hurts, but it is a lot more manageable. I can definitely lift my arm now.
I have them every 6 months but it only takes the edge off rather than solving the problem. I may have to have surgery or a needle lavage. Something has to be done put it that way as cortisone isn't the solution. I went to A&E in the hope they'd give me a shot but a friend told me that they wouldn't give it to me. Even though I knew this, the pain became so unbearable that I felt compelled to do something other than writhe around in agony.
I've gotta have a cystoscopy in 2 weeks. I'm not looking forward to that one!