You say your heart goes out of rhythm for no reason. In my opinion, there is always a reason. For me, even when under 20 years old, the culprit was caffeine. Some people are extremely sensitive to it, which includes me. I also had episodes which lasted several hours and sometimes all night.

Even 1/4 cup a day will set me off within a few days. Or maybe getting older, your heart cannot handle what it did before because of years of unhealthy habits??

If you are consuming ANY caffeine from coffee, tea, colas, Mountain Dew which has more than colas, chocolate, energy drinks, try abstaining for one month minimum and watch improvement. High sugar diet, which revs you up including your heart. Over exercising. I walk up and down hills to town every day, but do not jump around like a nut in a spa which the music alone could make your heart go too fast.