Hi, Thanks for your question. After going through your question, I would like to advise you- 1) Do not neglect these symptoms. - It is most likely due to heart problem. 2) Heart attack is due to sudden decrease in blood flow to heart. - Young persons usually do not tolerate heart attack well without treatment as there is lack of collateral blood flow to damaged heart muscle. - In older person when there is usually development of collateral blood flow to heart. So symptoms of heart attack usually aggravated when there is increased oxygen demand of heart as in any type of physical or mental exertion. 3) With every episode of heart attack there is permanent damage to heart muscles and there is progressive decrease in pumping capacity of heart. So you should not neglect these symptoms. Seek immediate medical attention. Heart attack can be confirmed by doing ECG, Heart enzyme test (Trop T/ I, CPK-MB usually immediate after episode) 2DEcho of heart which can help in determining pumping capacity of heart. Most definitive way to determine percentage of occlusion of blood supply to heart is coronary angiography. Hope this helps you, if so do vote helpful.