Don't worry mate, I understand coz I've been there. I'm still here though, and trying to survive another day, and having hope. If you're unmotivated like I am, well to be honest, I don't really have any advice. Sometimes I think a complete change in necessary, but I know that I don't deal well with change.
Maybe you should try to speak with someone close to you, who you feel might offer some support. The worst thing to do, is to isolate yourself and withdraw into a bubble, although this is the easiest thing to do. I would tell you to get out more, take long walks, and if you can drive go for spin just by yourself. Try to break free from your current state the best way you can. Good luck, I hope you feel better soon....