I have mild pain - discomfort all the time behind left shoulder blade. On this day (few day's ago) the pain was bad and then discomfort radiated all the way down left arm till left arm was numb. Once again I did not have any noticible difference, discomfort or pain in my chest. What do you suggest around this issue - I do have a history of gastro-intestinal and gas pains often. I am 51. Father had heart disease.