Bum shoulder.

Ok so I've had this slight shoulder issue since around August 2012. Not sure what caused it but the pain is usually off and on, sometimes a sharp stabbing pain, other times a dull achy pain. Anyway, it seems like it may have gotten a little worse. I tried throwing a football about a month ago and that absolutely killed my shoulder! The pain was intense and I didn't even finish the throwing motion. Needless to say, I was done after that one attempt to throw. I can still do most activities with little to no pain. Started physical therapy last week in hopes that the shoulder will get better. If not, I'm nervous I'll have to get surgery to correct the problem. That's not something I want to do! Here's hoping physical therapy works...