Here's a list of Horror genre anime from ANN:
Horror Anime List :evil:
I hope there are some there that you like.
Some I can personally recommend:
Beserk: It has a great manga and the anime adaptation is superb (if you can accept the 'old' animation style). It has a great plot and a host of interesting characters...And blood
Unfortunately the anime is very incomplete, as the manga has continued far beyond the start/end (if you watch it, you'll know what I mean ^^) point in the anime. There is also little to no chance of us ever seeing a continuation to the anime .:/
Monster: If you enjoyed Death Note, this is another psychological thriller which will keep you guessing, and some of the scenes are intense enough that I'm sure you'll enjoy them.
Ergo Proxy: Not technically a 'horror', more of a cyber-punk theme, but it has an excellent story, great artwork and is overall very creepy. (The female lead looks exactly like Amy Lee, the lead singer of Evanescence if that makes any difference.) :tehheh:
I think I'll stop there before I post a true wall of text. I hope it helps, it's never a good thing to be bored. :goodmood: