I am having pain in my chest under the breast bone when I breath in deeply. It is similar to the feeling you get when breathing deeply after running. I was at the ER yesterday it hurt so badly. It seemed to worsen after I ate. They gave me a chest xray, ct scan with dye, a chest x ray and blood work. They said that there was no coronary problem found. They gave a muscle relaxer. That seemed to work until today when I exerted myself and seems to be starting again