Not even sure how the pain Started. It is at the bottom of my left shoulder blade. It feels like the kind of pain you get from a good workout or after sleeping awkwardly but that usually eases up after a few days. I havent been working out or doing anything strenuous at all. Pain is worse when i take a deep breath or yawn. So much so that i actually cant take a deep breath/ yawn to the full capacity as its too sore. I havent done anything/taken any painkillers as i thought it was probably just muscle strain or something and would ease itself but its been 3 weeks now. Should i see gp?