Fast Heart Rate Causes Periodic Fast Heart Rate. Any Possible Causes?

Periodic fast heart rate. Any possible causes? - fast heart rate causes

I'm 23, 330 pounds and 6'1 ". I know I'm fat, but I was recommended by my doctor not to have too high blood pressure or anything. This fast heart rate is usually accompanied by heavy breathing and warm feeling. This usually comes down after eating something, or even walk down the stairs.