I had always thought there was major pain involved when you had a heart attack but I was wrong. The first one I had was like a severe case of indigestion that just wouldn't let up. The next 2 there was pain and one of them was bad. Screwy blood pressure isn't always there. But with all 3 heavy sweating was involved and my cardiologist advised that is one of the most common symptoms. Also there are some enzymes in your blood that point to a heart attack. I'm sure there are a lot more symptoms but that is all I can remember right now.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va