Shoulder advice please...(prefer from a dr. or someone with experience)?

I have been playing rec. softball but as soon as I begin throwing and batting my shoulder/upper arm begins to hurt. I then pay for it that night and in the following days...in the past it will improve fairly quickly, however now it is not as quick to recover. In fact, I have trouble lifting, getting dressed in the morning, and misc. tasks like that. I have gone to dr.'s in the past but they have all said I am fine and sometimes I feel like they think I am overreacting, but will place me in physical therapy anyway. Do you all have any advice? Should I go to a different Dr. or should I just live with it and hope it doesn't prevent me from being too active? Also, do you all have any suggestions on what this could be?Shoulder advice please...(prefer from a dr. or someone with experience)?
I have been having problems with my shoulder for the last two years and they said that I had sprained and slightly torn my rotator cuff. NSAIDs, RICE (rest, ice, compression and elevation) pt and the most recently I was in a sling for a few weeks. Maybe go to a different doctor might help as well.