Well, it's times like these that make me very happy to be an atheist.
It is infinitely better to believe in no god at all than to believe in a god who will not forgive people who take their own pain-ridden, diseased lives at a time of their own choosing rather than suffer just for the sake of some misplaced notion of faith.
If that's your god, I have to say he's pretty cruel and I have no use for him.
I guess one's conclusion depends on one's perspective. If one believes that life here-and-now is mostly about self in the here-and-now then they might go your way, but if one believes that life here-and-now is more about God and hereafter than it is self and here-and-now then a different conclusion can be reached.
Have you ever read the Gospel of John?
Intense personal suffering & quality of life vs taking one's life is a tough issue especially if you're the one suffering. I've been close to people who were suffering and debated with themselves whether to do it or not. But I hope if I'm in the situation that I can stay focused on keeping my life about living to serve Christ, even to a hard end.