Horror stories don't have to be about blood and gore. Read some of Dean Koontz's books for example. I found this about writing horror from one of the old masters, H.P. Lovecraft. Very interesting. Hope it helps you out. I read good horror all the time.
H.P. Lovecraft Gives Five Tips for Writing a Horror Story, or ...
www.openculture.com/.../h-p-lovecraft-gives-five-tips-for-