I am not sure exactly what the problem is, but it sounds very similar to an issue that I have had for about the last 20 years. It started while I was lifting, and I felt something pop in my shoulder. Eventually, it seemed to heal, but to this day, I cannot lift to much weight over my head without causing a considerable amount of pain. I never did go get it checked out, I have simply learned to live with it. I am however curious as to what is really going on. I am doubtful that anything can actually be done about it, short of surgery, considering it has been so long that I have been living with it. If I were you, I would consider seeing a specialist, and hopefully you can resolve your issue, and not have to live with it like I do.

Regards,
Cindy
shower chair