Hello, I can understand your problem. It is good that you are getting regular
health checkup. First you need to understand is heart attack in parents and there siblings, even though increases risk but are not going to recurr in their children for sure. So don't worry,, having good healthy life habits will well avoid the risk. The pain you are afraid now is mainly because of your anxiety. Remember gastritis, costocondritis, panic attacks all appear as heart attack and vise versa. When ECG is normal, blood cholesterol, suger and BP all are under normal limits, then don't worry, you don't have any disease.