I had a heart check 3 years ago but they found nothing back then.

I just want to be totally sure that there is nothing wrong with my heart so I think I will go to the doctor to monitor my heart longer than a few seconds to see that there is nothing wrong. I think only after that I can become calm about it.
Thank you for the advice.

Yes it is indeed terrifying and I think only a check up can calm my mind. I just really hope it is nothing serious.
I don't drink any caffeine or eat a lot a sugar (I also don't drink soda) But I rather stay away from medicine because last time I tried, it only made my panic worse.