I Have A Great Deal Of Pain From My Left

I have a great deal of pain from my left shoulder to my elbow, then I can't sleep on my left side, my arm feels better if it doesn't hang down and I hold it up, my fingers(thumb and first 2 fingers get tingly at times. I had an MRI last March and found out I had a small tear and physical therapy helped strengthen it but this is so much worse. I hope I won't need surgery but I can't deal with this pain. Thanks, Kay