Sometimes, rarely, I will get a pretty sharp pain in my shoulder/collarbone that lasts a few seconds and im really worried its a sign of heart issues/heart attack. Its only in that area, its never in the chest or anything. I have bad posture, my joints aren't that great, i don't stretch, and i sleep on my side and i don't have the best mattress, so maybe it's just that. These are all things im going to try to improve. But i'm so terrified. I just want to be convinced its not a sign of something horrible. I have some autoimmune diseases which I read already put me at a higher risk of heart attack/stroke and it terrifies me to no end, i'm so scared, i don't know what to do. I'm also scared of going to doctors