Bill I know exactly what you are going through right now. In the past three years I have had surgery on my shoulder not once but twice. First time I had a lateral tear a bone spur a syst and they had to trim down my clavical, even after all of that I was still having problems with my shoulder alot of times it would give out on me while holding my bow back or if I would throw a softball my arm would pop out of socket. Basically what it ended up being the second time was that I had torn my labrum(the muscle that holds your shoulder in place). from someone who has been through this take my advice SEE A DOCTOR. I went for a long time with shoulder problems and just shrugged it off thinking it was nothing the docs told me that if I would have came in sooner it would not have been as bad as it was. Good luck to you and I hope all turns out well