My left arm and shoulder,back and front and neck has been hurting a little like muscle pain. I had an accident 5 to 6 years ago and cracked my rotator cup. It went out of place and popped back in. Now every so often , I have this annoying pain that feels like its muscle related but I have always heard about the left arm pain connected to the heart. I take bp medicine and am over weight but had a heart cath when I was 50 something and everything was fine. I am 67 now. My legs dont swell nor does my chest hurt. I have had aniexty problems in the past. I can put deep heat on the shoulser and arm area and it seems to help a lot. What could this be.