Chest Pain and Dont Know Where to Turn

My husband has had severe lower chest pain now for 8 months.  They did find a blood clot in his lung after a month of pain and treated it and it dissolved very quickly.  Because he had a blood clot no one is looking into his chest pain.  The lung doc says it is muscular skeletal because it is tender to the touch but the rhuematologist totally passed it off as PE pain.  We know that there is something that has not been diagnosed yet but we have no clue what kind of doctor to go to.  Our primary doc is stumped and is offering no help at this time.  The pain comes and goes.  Today it hurts to move.  Sometimes it causes shortness of breath.  He has had about 8 ct scans and no more blood clots.  What kind of doctor works with muscular skeletal?