Dad had a heart attack and I couldn't figure it out

Please learn to recognise stroke and heart attack symptoms if you don't know already. They are similar to acidity and indigestion. I learnt the hard way today despite having read so much about it. It doesn't always happen like one expects, where patient clutches their heart or starts fainting, it doesn't look very different from common conditions like viral fever. Uneasiness in chest is a huge red flag no one should ignore. I was trying to treat symptoms because he had fever and a few other problems as well since before. Didn't even occur to me that it could be so much worse because I've never seen someone have a heart attack before. He was still walking around and functioning alright, albeit slower and with pain. Thankfully we managed to get to a hospital in time, but we should have gone sooner. The more one delays, the more difficult recovery becomes. I suspect the new covid strain is doing this, seeing a lot of other heart attack patients in the hospital. Please watch out for people with co-morbidities like diabetes, bp problems, cholesterol etc. I hope he pulls through this. Completely shaken today.