I have a rotator cuff tear plus other problems there (injury) and I used Ice to bed with a contraption sold in cvs where you put the ice pack in it and it wraps around your bad shoulder and keeps the ice in place. I needed help putting it on. The strap wraps around. It was agony until I went to physical therapy for a while and continued to use ice. I would question the use of the heat vs. cold. The cold has a numbing effect which is good to alleviate that pain. I used lidocaine roll on they sell at the pharmacy. I hope you feel better. I need surgery to correct mine. Never got it. Now I have two bad shoulders. The new injury.