Hi. Going to close this.
I am diagnosed with MDD. http://www.webmd.com/depression/guide/major-depression
I know what I am talking about.
First thing is, seek professional help. If you're old enough, just do it. If you're a minor, tell your parents.
Second, Suicide Hotline - 1 (800) 273-8255.
Call if you need to. Going to assume United States. If not, I'm sorry, don't know any number for that.
EDIT----------
Your profile says you're an Aussie. Don't know the number mate, will ask. (FOUND OUT) 1300 22 4636 (Beyond Blue) Thanks Ele.