I recently had a heart scare . Chest pains and palpitations. Out of the blue so I know what fear you have.
Ended up wired up in A&E ( E.R)
There is a saving grace to your predicament.
I had a specific blood test for heart attacks - It's called
Troponin 1 . This is 100% accurate
If it's above 0.01 ( the lowest measureable amount ) you've had a heart attack.
It can also give an idea of how severe eg 7.0 is severe.
If it's below 0.01 you DEFINITELY HAVEN'T had a heart attack and it can detect a heart attack from up to 3 months previous.
Mine was 0.01 - guess what ... It was stress ...but it sure felt real to me.
The house officer ( i'm in the U.K ) said 'Oh by the way we're concerned you appear to have high blood pressure..'
Hardly a surprise when you think you've had a heart attack !!! Sheesh !!!
I suggest you get the test done and also an ECG which could tell you if your heart has a problem of rhythm.(i know a lot about heart attacks now !)
Heart attacks are not mysterious. They are caused by blod clots in the vessels that supply the heart . Medication can stop this happening if there is a problem.
Please don't be scared to get tested because not knowing or being scared is surely a lot worse.
I don't know what the cost of this would be if you had to pay for it.
Hope this helps