M.T.
I have the same thing. It started 13 years ago right after my duaghter was born. I did go to one doctor, he had me wear a monitor and they found my heart to be fine. He said it was probably stress and to have a glass of wine. After it continued, and yes I was freaking out, I found another doctor who actually heard it with a stethoscope. I had an ultrasound of my heart and they found I have Mitral Valve Prolapse (MVP). I guess it is very common and most people dont even know they have it. I feel mine most right after I excercise, have caffeine, or get stressed out. If I were you I would ask for more tests to find out what it is. I also have a hole in my heart which they say is minor and may never affect me. Good luck and let me know if you have any questions.