what could be causing my ribs to hurt on my left side. I went to the emergency room on Friday and was told it is pulled muscles. They did xrays, EKG, blood work, urine test, CT scan--everything was normal. But the pain is not going away, it seems like my breast is hurting now? I m very frustrated right now--I want to contact my doctors office, but I m afraid they are going to send me to ER again.