I had been diagnosed with mitral valve prolapse in 2012. And, nothing has been relaxing ever since. The problem is sometimes my heart skips a beat (or I feel it does) some time I have shortness of breath and my heart start racing. whenever I go to er nothing on ekg, nothing on holter monitor. The symptoms never showed up during tests. I am not sure whether it's an arrhythmia or panic attacks. I have had two episodes in last three days and I don't even know if it's life threatening or not. I don't know how to cope with this..... just wanted to share. Thanks for reading.