I know what you're going through. I've had severe deppression 3 times in my life, when I was 11, then 13 and this same year.
I must say I really felt like crap during those days. I used to think the worse for every situation, I felt my life was worthless, I thought I hated everyone and everyone hated me and spent half of the day thinking about how to kill myself without any pain (lol), and the other normal symptoms of depression.
I went to therapy several times, and was told to take fluoxetine (Prozac). I did and it didn't really help me very much, so I stopped taking it. What really helped me was the therapy itself, because my deppression was due to familiar problems, specifically the relationship with my mother (the hardest people to live with in the world). So I got to peacefully solve my differences with her, and slowly got better.
My mother herself has been through deppression a houndred times in her life, but she is healthy now, and you know how did she got better? By stopping the medicines (Venlafaxine 150mg). She chose not to give up, she would not depend on a pill to be satisfied with her life, she would not surrender to depression. Slowly she reduced the dose until she could stop, helping herself with a psycho-analysis therapy, and it worked, at least for her.
What I'm trying to say is that the medicine itself won't cure the deppression. On my life experience, I think deppression shows as the result of several issues with someone or something important in your life, and what will really cure it is to solve those issues, more than taking a medicine to temporarily run away from them.
BTW, Deppression is a very curable mental state, you won't die from it.
Best Wishes
Alex