MY HEART IS GOING TO STOP BEATING

I completely understand how you feel!
I get very very paranoid about really random things. Especially things that are fatal like a heart attack or getting some kind of illness.
I was terrified to eat meat for a while because I had this paranoid thought that I was going to get E.Coli. And I'm terrified of taking medications because I always believe the rare side effects will somehow just happen to me.
Sometimes I randomly get pain in my head and automatically jump to the conclusion it's a tumor or my heart will feel really weird and I'll think about it and then it'll feel like my heart is going to just stop beating so I panic.
I know how much of a struggle it is to constantly live in fear of EVERYTHING. It's been getting worse for me.
I would definitely express to a professional how this is affecting your everyday life! And just know you aren't alone. When I get panicked or paranoid I like to put my feet in hot water in the tub, because I read that stimulating your sense of touch like that can help distract your brain and prevent you from freaking out! It does work for me sometimes and calms me down!