I can relate. I've been depressed for a long time now. It was like you said and I thought I would never feel better again. Suicide was a major consideration for me and I still think of it sometimes, but with a change in medication I am feeling a bit better. I can even read a book now.

Hang in there. Tomorrow could always be a better day. I keep telling myself the suicide is a permenant solution to a temporary problems. I read it somewhere and thy to keep it in mind when things get bad.

Hope you feel better soon.