I never had a heart attack but when I retired I asked my doctor to send me for a stress test as I felt that I was not as spunky as I should be (I have worked out at the gyms since I was 29) and have a family history of heart problems.
I took it and they found that my heart rate would not come down as quickly as it should after the test. More tests and they found a blockage of 70% in my main artery and put in a stent. Exact same blockage my mother died of. I felt 10 years younger after the procedure.
Right after that, one of my fellow Boy Scout Leaders dropped dead of a heart attack while going for a short hike with his boy. I wish to God I would have said something about my tests to him at the time, who knows, it may have made him see his doctor before the heart attack.
Now I tell everyone who will listen, if you don't feel like you know you should and have a family history of heart problems, please go see your doctor and ask for a stress test.