Sir Sometime I Feel Burden In My Chest And I

Sir sometime i feel burden in my chest and i feel sweet with reduce body temperature and low blood pressure. I feel so much worry and low. This happen to me at the gap of 15 months. I have done my ECG and Echo test both are normal. I have 5 feet 2 inch height and 81 kg weight. i dont smoke nor drink. My father and mother both are normal.My immediate family members have no heart disease history. still i worry so much.kindly guide what should i do