Have you talked to a doctor of some sort? I mean, we're not docs, so we're not really qualified to give advice about depression. I would suggest talking to a councilor at school, most colleges have some kind of free psych stuff. Or you could talk to a family practitioner or internist. They know the typical signs of depression. Please go to someone other than anonymous people on a public forum.
We can pull all sorts of stuff out of our asses, check the politics forum.
