I was told that I have had a mild to moderate heart attack and now take diltiazem 180 at night , then my MD stated that I was lucky as the type of heart attack that I had was the one that kills young suddenly it is in the lower pointed part of my heart that no longer works according to the cardiologiest  Should I feel discomfort from time to time?
Hellothanks for posting here. Going by your description, you seem to have vasospastic angina or primeval angina or variant angina. In which your arteries go into spasm. For the same you are on diltiazem. It will prevent the spasm from occurring further. It usually will not cause you time to time discomfort. Check your BP and pulse when you are feeling discomfort. You have to be on diltiazem to prevent spasm thank you