My husband had one three weeks ago. I came home and he said he was having chest pains. He was very uncomfortable but didn't know if he wanted to go to A&E. After about an hour he said he did want to go so we got in the car. By the time we got to A&E, about 10 minute drive, he was fine and just feeling a bit breathless.
A&E did an ECG which was fine and blood tests were fine but they wanted to do the blood test again after three hours as they said if you do it too soon, you can get a false negative. Three hours later the blood test showed he'd had a heart attack and was admitted.
I suppose my point is that it didn't last that long and was all over by the time we got to hospital. If they hadn't done the tests, we'd have presumed it was just chest pain and not a heart attack so please go and get yourself checked out.