Thanks guys. The orthopedic Dr doesn't think it's a rotator cuff. She showed me on the xray that the shoulder socket has a very narrow gap on the top where the arm bone fits in the socket, and it's inflamed. She put a shot of cortisone in 3 weeks ago. That helped for about a week. Now it's feeling worse. She said if it doesn't get better, then an mri and possible surgery to trim the socket and open up the narrow gap on top. Won't know for sure till she reads the mri.