Is there a word to describe the feeling of utter wrongness?

I’m talking here about the feeling of wrong that one gets when one feels something which isn’t quite painful, but so utterly non-ordinary that it’s horrifying. For example, feeling one gets when one bends a fingernail backward, or when someone takes one’s temperature rectally.

I’ll bet there’s a German word for it. The Germans have all the best words, and they have a word for everything.

Does anyone have any guesses?

(I haven’t been on Fluther for ages, but I’ve had no luck with this question anywhere else.)