Hello, Iam a 25 year old male with no known health problems. Several weeks ago I started back to work after a year off. I work in the construction bussiness doing alot of heavy lifting and shoveling. Recently I began having a dull ache behind my right shoulder blade. Then two days ago I began having an extremly sharp pain under my left breast that would shoot to a point in my left arm usually up to my elbow on the inside of my arm. It is off and on and Iam unsure wether I should get it checked out. Mainly due to the fact I have had an anxiety problem in the past and have amassed alot of doctors bills due to this. I have had several EKG's, Chest X-rays, Blood tests and a Holter Monitor all have came back negative. Could this possibly be muscle strain or possibly GERD symptoms? Or would I be best to rush myself to the E.R.?