I m 30 years old and I ve had this pain that started on the left of my shoulder, armpit , breast and down my arm. I went to the ER because laying down was more painful and I was told at the ER that it was musculoskeletal pain it already been a week and I m still having ache on my left arm. It feels kinda sore and tingly then the next I ll feel the pain in another spoilt but the one in my left arm never really goes away it isn t very painful it just bothers me what s going on? My EKG came out fine and also my X-rays