Those who've gone through it, how does it feel like?

I am in a situation strange to me; I don't know if it's a breakdown. I actually overworked for past 7 months or so (18 hours on extreme days, 8-10+ on average), and now I can't write code. I don't want to. Something in me has given up something. It's like a ship is stuck in middle of very peaceful sea with no water or wind current whatsoever. I have little money left but I don't care about it. Nothing is motivating me ahead. Learning something new always work as an escape plan for me, but even that is not working. I don't want to play games or read sci-fi or anything that want me to move a finger. I am lying in my bed all day long doing nothing.

What shall I make of this situation? Is this what people call breakdown? Or am I out of fuel for good? I don't see any exit myself; sometime I get frustrated with myself and want to end everything (for a man self is the world). But I don't.

I used to really really love programming; I have spent 70% of my life in front of my computer since I got one of my own (about 5 years ago). It was always fun, I was never tired or bored. About 7 month ago I got a big project (I used to make small apps/websites for pocket money earlier) and I started giving it my all. It brought me even bigger project from same client (also my mentor); I gave it my all too (spent 10+ hours a day on it). And the third project I got from same client is even bigger. For about a two months, I worked on it with full dedication. Then for past month, I started slowing down. But I still pushed. And then suddenly I couldn't think clear. All of a sudden the project wasn't interesting at all. I used to love it when I started. I am physically well now, can think clear. But I still can't code. I don't know why.

I've always loved programming, and the fact that I am not doing it for no reason is killing me.