Depressing books that make you cry throughout reading.

I want book recommendations where I cry throughout the whole book and not just at the ending.

Something like how the author makes us attached to the mc who's suffering mentally and physically from the backstory which actually has to make me sick to the point of me crying pathetically, I want the mc ruined, broken down and ripped away from their happy life. I want to see the character presently suffer through misery and struggles from their past trauma and live with it. The book can be dark as hell torture, murder, abandoned, or whatever horrible genre. It can show how fucked up the mindset is after the gut wrenching backstory or how the character is stuck in the past, I don't care it just has to be utter agony to read.

I don't care if its an happy, sad, or an open ending I just want a good plot and that the book would make me utterly sob and breakdown as much as possible through reading.

I know a book like that is practically impossible to find a story like that with miserable agony with a good plot but please recommend anything close to this that would make me cry throughout reading.