Fight depression.

I have such a problem, I work on a rotational basis for 2 months at work and 1 month at home. When I am at home, for the first two or three days everything seems to be normal, then something like apathy or indifference to everything sets in.
You lie on the couch or sleep and so the whole month. Maybe I'm of course confusing something and maybe it's not depression? I used to play almost all the time, but now I’ll sit down 2 or 3 times for a PC in a month and that’s it. I can't seem to find myself. Well, it looks like he spoke out. You do not scold much .... Just had to speak out? Maybe someone has such a problem? Write how you could overcome or could not?