I feel like reading a fucked up story, can be gorish bloody with lots of violence,pain, sa...

have you read killing stalking?

Yeah, warehouse, most of harada's work, ogawa chise... I want darker stuff

Well.... usually any I bump into I immediately want to forget so I can't really help you there.
Try http://www.mangago.zone/read-manga/funouhan/
And the manga "Berserk". Someone recommended it to me and I regret looking into it.

Doreiku Boku to 23-nin no Dorei

Tori Maia

following

Dolly kill kill, Attack on Titan, Tokyo Ghoul, Tokyo Ghoul:re

Not my fav, but the most messed up one that I can remember the name of is "Fasting" by Kazuo Umezu & Hisashi Eguchi.

Found this list http://www.mangago.zone/home/mangalist/38849/ maybe you will find some here

Try Itou-san by Kuraka Sui. It's somewhat disturbing and bittersweet.

http://www.mangago.zone/read-manga/itou_san_kuraka_sui/

There's also a prequel to Itou-san called I: Episode 0.

Thanks for all these recommendation!