Books that would make me question why I’m reading it but I would not be able to put down!

I’m looking for books that will completely mess with my head. Something shocking, disturbing, weird, or thought-provoking in ways I wouldn’t expect. I want stories that are unsettling, grotesque, or psychologically intense, with narratives that leave me questioning reality, morality, and/or the humanity of people.

I appreciate well-written prose but not pretentious. Twists mind-blowing yet make perfect sense (no cheap shock value or plot twists for the sake of having one- – please no Palahniuk).  Psychological thrillers, existential horror, or philosophical fiction that pushes boundaries… Anything that makes me sit back and say, "WTF did I just read?". I also like books that present deep moral dilemmas, especially if the author or the main character is problematic and seems to be justifying immorality and engaging in a looped debate with me. 

For examples, authors that I have enjoyed:

George Orwell, Marquis De Sade, Osamu Dazai, Natsuo Kirino, Yukio Mishima, Philip K Dick, Jose Saramego (one of my absolute faves), Aldous Huxley, Franz Kafka, Ryu Murakami, Margaret Atwood

Books in my physical TBR:

The Monk (Lewis), We (Zamyatin), The Manuscript Found in Saragossa (Potocki), Against Nature (Huysmans), 2666 (Bolano) 

I have been in a slump but I want to get back into reading so thank you so much!