Depression?

So a couple of years ago in my freshman year of college, I was very depressed. I had never been depressed before so I honestly didn't think I was. I thought I was very homesick and just lazy. I eventually realized I was depressed after not being able to get out of bed for a week. I sought out some counseling. Basically as soon as u moved out of the dorms I was doing much better. I guess I would describe that as situational depression. I have not had a depressive episode since, but lately I've been sleeping through my classes, i don't have the motivation to do my course work. I don't want to go out. I just want to lay in bed all day...