I sounds like you may have Mitral Valve Prolapse
). Your valve open and close to allow blood to flow throughout your heart, if you have MVP your valves don't close correctly or all the way which allows blood to flow backwards. It is very common in women. For some it is not a major problem and the symptoms may even eventually fade but for some it can be more extreme. Other symptoms include dizziness
). I was diagnosed with MVP in 2001 and I've been on medication since 2002. The meds help a little (I don't have as many episodes) but I also have bouts of A-Fib. If it get to more of a problem I would suggest seeing another doctor. They'll have to put you on a heart monitor to accurately diagnose you.