Hi, I'm 21, and I've been noticing more and more that my heart will suddenly beat fast then return to normal. I've only had one episode where my heart beat really fast for about 5 minutes, but then returned to normal. Now, I've just been noticing that every once in a while I'll feel like my heart "skipped a beat" or had an extra beat or something. I never feel light headed or sick whenever this happens, it's just really uncomfortable and nerve racking.