As far as those horror anime go you could try the second season of higurashi, but that isn't as horror/insane oriented as the original is and there is also umineko (although I'm yet to watch it) which is created by the same people with a somewhat similar theme. You may also like Death Note and Gantz although I wouldn't call them horror.
Heya. :) Just wanna let you know that double posting, that is posting consecutively, is not allowed. If you forgot to add something to a post, just use the edit post feature. There's an edit button in the lower right corner of your posts, so use that next time instead of posting twice in a row please. :)