Hi. Thank you both for your reply.
Since then I made some research and I talked to some people and I am pretty sure that I had a heart attack. And I had palpitations since then, I don't think it's paranoia.
And I am so panicked whenever I think about
what happened, I think that if they will monitor my heart with a holter, they will missdiagnose me, because I will be so panicked and my heart will beat faster and maybe irregular. And maybe they will prescribe the wrong medication that will damage my heart even more.
I don't know what to do, maybe I will have another episode like this and then I bet I will get scared enough to provoke myself a heart attack, if I didn't have one the last time.