The point with the "you can always kill yourself later" and the "just live one more day" attitude is that I've been doing that for a long time. I've become very suicidal about one year ago, and since that I've been "holding on one more day" every day for one year.
And when I first read that advice, I didn't realize that this one more day would become one more year, and now I can't accept the fact that this one year might turn out to be 10 years, or more. I just can't keep living that long.
It's a shame that suicide is frowned upon. I hate existence, I can't see one single reason why I should "be".
I would give anything to just be dead tomorrow.