@harryhuse– Pains like that for me the first time were in fact the beginnings of a major HA. Mine continued to progress and yet when I was brought into the ER all those typical tests (EKG, X-Ray, Blood Workup, etc.) didn't show that I was having a HA? It wasn't until they sent in a ECHO Tech to begin that test that they discovered that I was in fact having a very serious HA. Since your's have not progressed more than likely it may be a possible overexertion physically? Can you think back when you may have tweeked your yourself doing something such as lifting something that was awkward?
I more recently had a similiar pain that was not going away and decided to have it checked out in the ER. It ended up more likely they said to some overexetion which I remember doing. Don't ignore the pains and if necessary try to request a stress echo. I believe that is the one true test that can provide a cardiologist the info they need to determine what is going on. Hope that helps. Jim@thankful