Why So Scared?

I am the most paranoid person I know. I’m extremely scared to sleep out of fear for dying in my sleep. Its gotten to the point that I have to take sleeping pills every night.
I also have an immense fear of being poisoned. Last night I had a strange taste in my mouth and ended up making myself throw up to try and fix things.
I’ve never tried to get diagnosed and don’t have the money to, but I just want to know whats wrong with me..0or at least where some of this is stemming from.

Any help?