hello, Mostly it s a acidity and reflux disease since your ecg and evaluation is normal. It will take some time to resolve. But still we can t rule out heart issues even if ecg is normal. If symptoms do not resolves then you should get one treadmill test done. Does this occurs more on exertion and decrease on rest, if yes it s likely a cardiac. You can also try using tab sorbitrate 5 mg sublingually whenever there is heaviness. Do you upper abdominal pain, nausea, bloating, burping, increase in pain on food, sour water feeling in throat or chest burning, if yes it further supports the diagnosis. You should avoid fatty, oily and high calorie diet. Have some walk after having food instead of taking rest. Have multiple small meals instead of heavy meals. Have regular sleep habits and avoid stress. Lots of green leafy vegetables, fruits. Avoid smoking and alcohol if any. You can with rabiprazole and get DSR form of it. Also, you can add syr sucral O two teaspoon three times a day for a week.