I just thinked about suicide, but never had attempts. My suggestion would be to open something like a war in your mind, against that voice in your head that tells you that you are worthless staying alive. Find something that gets you going. Start getting busy, even if you force yourself into it for the first times. I like listening to music a lot and it really changes my mood. When I listen to, for example Guns N' Roses, maaan I get a kick, something that you'll never get being sad all day and contemplating your existance. This is what works for me. Sorry for my nasty english.