I think I'm dying please help?

Hi first off I have to say I suffer from anxiety and hypochondria. Now I always fear everything but sometimes I randomly get this unexplainable wave of fear that im about to die. I am 18 yrs old with no other ailments so my question is is it possible for me to just drop dead out of nowhere with no symptoms of anything. I figured if I asked this and I got a good answer I can calm down a little bit