I have gradually accumulated, so to speak, severe pain in the muscle next to my left scapula. I have injured muscles my whole life due to athletics, work, and more work. This time I have something very different. When I get still and am not using my back muscles, generally when I lay down to sleep, they get extremely painful and I get tingling down the back of my left arm and the outsides of my two left fingers on my left hand. This tingling has me concerned. This pain is extreme and muscle relaxers do not help at all. What am I dealing with here ?