to add to what everyone has said; you need to have a keen understanding of how to search for information. No matter how good search engines are and no matter how much information is out there, you must ask the right questions to get meaningful answers.
Google "will I die" and you'll get yes.
So my advice (extending that of **** and Superman) is to accept
that you just don't know and stop panicking. In my view panic attacks are a manifestation of helplessness. Such a feeling comes from having the wrong idea about things.
Life is full of mystery and what we expect to happen often doesn't.
My advice to you is that keeping calm and attentive will probably save your life more than walking along reading your phone in the city, driving badly, not eating right, smoking, regular binge drinking ...
I suspect that part of your problem is that people today have the impression that they deserve something or are able to control what happens.
https://cjeastwd.blogspot.com/2015/09/denial-or-delusion.html
With all my personal parameters (of OHS and valvular problems) rational analysis would suggest I'd be dead before my friends. I'm not.
Take a breath and get back to what is in your power to control, which can only be how you react to something. Yes I've also faced the possibility I'd die but my approach was to understand the situation not panic about it.
Enjoy your life, you don't get two and you shouldn't waste the time you have with negative and self destructive thoughts.
Best Wishes