The only hell you need to worry about is the one inside your head which is causing you all this fear.
The way to deal with it is, every time you find yourself thinking of hell (and getting scared of it), come up with something to tell yourself that counters the fear (for example, "I am not going to be afraid of this"). It takes time, because the brain has to strengthen the new nerve pathway you're creating to replace the one that leads you to be terrified, but it does work if you keep at it. I used a similar technique to overcome my tendency to get angry at the stupid things that people would do on the road, but I just kept telling myself that it wasn't worth getting angry at them, and eventually, I didn't.
Another thing you can do is, when you find yourself getting afraid, stop and take a few moments to simply breathe, and concentrate on maintaining a regular in/out rhythm. Fear seizes up the body's processes, so the best way to disrupt it is to focus on returning one of those processes to normal. There's no reason you can't combine the two, of course.