I am a graduate student of Chongqing Medical University. I've seen your condition. It's probably atrial fibrillation. This normal person will also appear. It is suggested that an electrocardiogram should be done during the attack, which can make it clear that atrial fibrillation will induce heart failure. This is probably why you feel heavy heart load. Go to the hospital for a check-up sometime. If you have heart failure, you can see it. You'd better go early when you have an attack.
Very detailed. Pay attention