i was using my shoulder to keep my phone up to my ear and reaching above my head to open something and when i popped it open and at the same time it felt like a rubber band snapped/broke in my back near my scapula. the pain wraps around from my spine to the left side of my breast. i also feel sharp, stabbing pain inmy collar bone too. its the worst when i try to take a deep breathe, cough, sneeze or laugh. i cant get comfortable at all. what did i do to myself? it seems like its getting worse as the hours pass. i went to get an xray and they said it looked fine. ive never dealt with back pain before and its a serious pain. sharp, stabbing that make me freeze and yell out.