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Let me prefix this by mentioning that I only have minimal experience with the genre.
I think Livre Troisième from Les chants du hasard could qualify as unsettling/disturbing. Also check out their newest album, which goes into a more black metal direction, if you are into that.
The other one that comes to mind is The Umbersun from Elend
So many cool suggestions in the comments, I have to add a mention of Ennio Morrricone's soundtrack to "The Thing".
On a personal note, Shnitke's Concerto Grosso #1 always sounded like a manic bad dream to me.
Nick Cave - Tell Me What That Is from the Wind River soundtrack. It’s more sad and unsettling once you know the context and what happens in the film.