excruceating pains in my right mid and upper back

4 months ago I started having excruceating pains in my right mid and upper back which gets worse with a deep breath. I have had a CT and an X-Ray which were insignificant as far as lungs are concerned. A breathing test shows my lung capacity is normal. I do not have blood in my urine nor do I feel the symptoms of a kidney stone. I went to a pulmonologist ofter my family doctor gave up....he is thinking in terms of a heart problem, blood clot in the lung, or a kidney infection. I was tested last week for a kidney infection...l had a mild one that was treated....my concern is this pain has been going on for 4 months...so it could not be a heart attack or annurysm...I have had blood clots in my lung before and I coughed up blood an fainted. Please me give me some ideas.