I am pleased to hear that malignancy is ruled out. Regarding the other possibilities you mentioned, I do have a several questions for clarification.
Can muscle spasms or ligament strain create pain constantly over many months and even deteriorate with time? My physician checked me for costochonditis, but he ruled it out. And, if pain is caused by anxiety or panic disorder, is it likely that it would not respond to anxiety medications like Valium or Ativan?