Did they find out what it was?? I know this sounds really weird but my bf actually had severe chest pains and we found there was an airbubble lodged somewhere in his chest and after some rest and advil and stuff he got better....he also had severe shoulder pain too....hmm im not sure if thats what happened to your dad ...but just an idea...hes in good hands if he is at the hospital...ill make sure i keep him in my thoughts good luck