Just some heart flutters I hadn't had before that I in hindsight should have probably got checked out. They continued after I had the heart attack but have disappeared completely now. But lots of people also have them and they're completely benign so who knows really.
I was swimming hard 5x a week and didn't notice anything during that and the weekend before was hiking about the countryside carrying my kids on my shoulders so it feels a bit of a mystery. I'm pretty sure, again in hindsight that I had a milder attack/angina on the Thursday before which I chalked up as heartburn. Because it was during the night I sort of soldiered through it and fell asleep again. Which could have been very bad.
The actual heart attack I had whilst swimming and because I'm an idiot, just slowed down a bit and finished another 30 minutes of swimming. It only got very painful after I was chilling after my swim. I got out and dry heaved a couple of times in the bath room and walked home. Lay down, took some antacids, that did nothing and it was painful so got my wife to take me to the hospital. They seemed pretty skeptical that there was much wrong with me until they hooked me up to an EKG and then I got filled full of drugs and ambulanced straight into surgery. Ended up with a stent as the main left artery feeding the heart was totally blocked. It's an amazing experience as you're totally conscious for the surgery and get to watch whats happening on a monitor. The only really painful part was a lower branch getting collapsed, I got some morphine for that but am not 100% convinced it did much of anything. Instant relief once it was opened again.