Do you only want season 8 fics or are all suicidal!Sam fics fine?
Unfortunately, I don't have any s8 but I can rec you two of my favourites - in both of them Sam tried to commit suicide, they're pretty angsty but there's a happy ending. But I understand if it's not what you are looking for :)
It's also possible you've already read them, but anyway:
Baba O'Riley and Eleanor Rigby walk into a bar (http://sammehsayum.livejournal.com/4122.html), Sam/Dean - sammehsayum - When Dean Winchester was four years old he almost lost his younger brother for the first time to a fire. When Dean Winchester was eighteen he almost lost his brother a second time to a full bathtub and a pack of sleeping pills, citing some decidedly unbrotherly feelings in his suicide note. At twenty-two he's about to lose him for a third time to Stanford University.
The Ghost of Somebody At His Side (http://runedgirl.livejournal.com/43984.html), Sam/Dean - runedgirl - The night before Sam Winchester meets with his 12th grade guidance counselor for the second time, something very bad happens. One of those somethings that takes only a ridiculously short amount of time – in this case, about three minutes – yet manages to change the course of two lives forever.
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Unfortunately, I don't have any s8 but I can rec you two of my favourites - in both of them Sam tried to commit suicide, they're pretty angsty but there's a happy ending. But I understand if it's not what you are looking for :)
It's also possible you've already read them, but anyway:
Baba O'Riley and Eleanor Rigby walk into a bar (http://sammehsayum.livejournal.com/4122.html), Sam/Dean -
sammehsayum - When Dean Winchester was four years old he almost lost his younger brother for the first time to a fire. When Dean Winchester was eighteen he almost lost his brother a second time to a full bathtub and a pack of sleeping pills, citing some decidedly unbrotherly feelings in his suicide note. At twenty-two he's about to lose him for a third time to Stanford University.
The Ghost of Somebody At His Side (http://runedgirl.livejournal.com/43984.html), Sam/Dean - runedgirl - The night before Sam Winchester meets with his 12th grade guidance counselor for the second time, something very bad happens. One of those somethings that takes only a ridiculously short amount of time – in this case, about three minutes – yet manages to change the course of two lives forever.