Try going for walks during the day, that'll make you feel not so depressed. It's worth a try.
If he was just depressed, then I can see how this might be useful advice. Even if you have clinical depression, taking a walk can be helpful, and sunlight (well, any bright light) can help your mood. Even taking care of a cat or a dog (and for some, even a houseplant) can be very theraqeutic. But based on his post, that getting out in the daytime is one of his primary difficulties, so it's not very useful for HIM.
What I suggested in my first post, that he seek assistance -- get on the phone with an actual medical doctor, or some local social service agency that can lend their help. I was lucky in that I actually had a close friend that had experienced a bout with depression, and got me out of my house when I wouldn't answer my phone, and helped me get started on the right path. But for someone who doesn't have a friend or close family to help him, it becomes increasingly difficult (and to him, based on my personal experience, it must feel impossible) to get the help he needs.
I DO know that most emergency rooms will also deal with mental as well as physical health crises. But if he can't get himself to an emergency room, then I have no idea what kinds of social services would be available (anyone know?). I mean I really feel bad for the OP, having been in a similar situation. I really do hope he gets the help he needs.