what if you killed yourself with N or a similar drug and had the most peaceful passing possible, it may even be pleasurable since it interacts with GABA. an eternal "torture" by literally sleeping while completely unconcious just seems like a non religious death to me.
not to ad fuel to the fire, but what if this life is your punishment for already having killed yourself many lifetimes before and you are just repeating it over and over? i really don't think that a god that punishes for eternity exists, there may be a way out of this cycle since almost every single religion believes in some form of redemption.
and who's to say what religion is the real one, if there's even a real one at all, did you know that the mayans had a goddess that assisted those who commited suicide to reach heaven? if there is really a higher intelligence that created us, i don't believe that it has any real reason for eternal punishments, what would be the point?
this is all about perspective and making peace with your decision, it is important to remember that regardless of how we die, we are all going to die one way or the other. and even if there is an afterlife full of turture, how different is it from a life that is already hard enough that we wish to end it ourselves.
i lost my faith long ago, maybe i never had it to begin with, but i still want there to be an afterlife of some sort, i hate everything about myself but i've grown attached to this consciousness and to the little things that i want answered about life itself, so instead of fearing eternal hell or vanishing forever, i just think of death as a natural step in this journey, it is not something to be feared since i'ts inevitable either way.
i hope that this wall of text helped you to some degree.