Movies below are not necessarilly horrors, but suspense and uneasyness is plentifull. Body horror - pretty much anything from Cronenberg - Videodrome, Dead Ringers; Naked Lunch is WTF movie if I have ever seen one. Weirdness makes up for luck of horror, movies that can make you dizzy. Different kind of body horror - or anything - movies by Takashi Miike. Ichi the Killer (https://www.imdb.com/title/tt0296042) was one of the nastiest movies I have ever seen - really testing your boundaries. Audition (https://www.imdb.com/title/tt0235198) is maybe even worse on that . Animal Attacks - Roar (https://www.imdb.com/title/tt0083001/) - idealistic propaganda movie about animal rights from animal lover Tippi Hedren and her daughter Melanie Griffith that turns into most suspenseful thriller - not because of scenario, but because of conditions on shooting. Hedren and Griffith lived with bunch of wild animals, and in this movie they are working at closest range with wild, untamed lions and other great cats to show how they are noble creatures. Most of the crew got serious injuries, some got bitten or scalped by lions etc. Surreal. Don't know in which of your category to put next movies, but they are postapocalyptic - so maybe Down to Earth? Day After (https://www.imdb.com/title/tt0085404/) and Threads (https://www.imdb.com/title/tt0090163). 80's try at realistic depiction of effects of nuclear war. Frightening, like all warning movies. As a child could not sleep for days after watching this. Threads is especially fucked up. The Road was soul crushing movie, post-apocalypse at its worst; probably seen by everyone, but must see.