In the early 90's I started experiencing the skipped beat, followed by the more pronounced 'bump'. It would do it several times while lying in bed at night. Went to a Cardiologist. Mentioned mvp, but did nothing. Wasn't worried. Later, I had a faster heartrate. Caused me to go to the ER. I ended up with a halter monitor. Pushed the button when I felt an episode. Later my Cardiologist said that he saw nothing wrong with the Halter test.
I have an Aorta Stenosis [which is why I had a Cardiologist]. They did several tests, ekg, echo, others and after a while of going in every year or so, he said that I didn't need to come back again unless something else starts happening. Well, that was probably about a decade ago and I haven't been to a heart doctor since. At the doctors suggestion, I cut out caffeine. My palpitations only happened once in a great while.
Recently, I've started noticing more palps. One every so often. Last night [and this happened a couple of weeks ago as well], I rolled over on my left side and I had flutterings/rapid heartrate that lasted for a few seconds, then it would go back to normal, though with a little higher heart rate than resting. After a few seconds, it would do it again. When I rolled back onto my back, they seemed to stop.
I've seen some other threads related to this and may try some supplimentary magnisium pills. Perhaps B complex. And continue taking my multivitamine [I've missed the last two nights].