How do you know if you are having a heart attack or it's just "angina" pain?

Pain on exertion/aft: Angina is a chest pain, due to ischemia of heart muscle due to obstruction or spasm of coronary artery. Caused by atherosclerosis of artery leading to the heart.Angina pain comes after exercise or physical activity or strong emotion and lasts less than 5mts.But it can lead to unstable angina at rest and angina lasting more than 15 minutes and at rest as in heart attack pain may be in neck, jaw , arm.

Classically: Angina pectoris =substernal pressure, pain with radiation to the neck or left or right arm and shoulder. Some will have abdominal pain-and be confused with gallbladder or stomach symptoms. Ladies seem to have less classic// or tolerate pain better than men. Relief with Nitroglycerin is very suggestive. A feeling of impending doom, pallor, sweating suggest a bad day!