You need to see your doctor, but my guess is you are missing some nutrients that you need. When you get sick, you lose vitamins and minerals and such. If you dont have enough of, or if you have too much of certain things like (magnesium, potassium, etc...) this could cause heart rythm issues. You need to be sure to eat lots of healthy foods and fruit and go to your doctor to make sure thats all it is.