Have i experienced a silent Heart Attack?
A heart attack or MI (myocardial infarction) is where some of the muscle in your heart is deprived of oxygen and dies. It does not sound as if the problem was a heart attack as the cardiologist would probably have done an echo/ECG etc and would have seen if any of the muscle has died. However it would probably be best to talk to your doctor about this as it is obviously worrying you.