As others have mentioned, rest is a good idea, as well as ice after shooting, stretching, and perhaps otc N-saids. I have found low resistance, high rep strenth training to be the best way to reduce shoulder pain. BTW, I had a class 3 separation of my bow arm shoulder, which was only partially fixed with surgery, and tend to get tendonitis in my draw shoulder, especially with late peak draws, or bows that are too long a draw length for me.