About three weeks ago I developed a sharp pain in the right chest right under the breast bone. I thought it was gall bladder and the sonogram and blood work proved negative. This pain is not constant. When it comes it seems that after exertion it intensifies and not during exertion. When it comes it is difficult to breathe without alot of pain and when it goes, deep breathing does not affect it at all. Eating does not aggravate it. there is no loss of appetite. No change in bowels. No nausea. At times when I walk up stairs i will feel it after I reach the top and my heart speeds up and then there are times i do not feel anything.