I've had a really bad cold for almost a month now. It got better, then it turned into tonsillitis. After taking antibiotics that has cleared but the sever coughing has continued. Here is the real mystery. I have noticed there's a bad tenderness, soreness to the skin under my left breast over the rib cage. Just on the one side. There's no redness so far, only really sore. What could be causing this?