Hey man, like I said, it happens. Sometimes we set the alarm right, it does a whole heck of a lot of noise but we just don't wake up... Happened to me once. It's so bad, but it happens.
Hey bud, life is like that, just appreciate the good moments. In fact my life was like that last year, and that just when things start to look up, it all goes crashing down. (Oh course I didn't have suicidal thoughts.) So this is something everyone goes through. And like I said in the shoutbox, you are not alone, there are people that can help you, So don't be afraid to get help. It's better then the alternative.