That was my first year of University to a T. Seriously. I don't remember much because I just barricaded myself in my room and did absolutely nothing.... My marks suffered greatly and so did my chances at maintaining any relationships (whether it be romantic or friendly).
I finally hit bottom and realised that I was in serious trouble. Not so much academically or socially, but physically and mentally. I couldn't function any longer, so I decided to go to my school's counselling service and talk to someone. Even just talking to someone helps. They put things into perspective and recommend ways to reconfigure your life and your house and your eating habits to make your body and mind feel so much better. Though they were small changes (and therefore small effects) they eventually helped build the road I would travel to recovery from depression.
I would definitely recommend seeing someone and just talking about what's goin on. If you've done it already, fantastic. Take what they say seriously. Also, for many people, it takes trying many different medications before you find one that's right for you. Be patient, because you will eventually find the winning combination of medication and therapy that will help you recover. You'll see the world so much differently and realise how wise and awesome you are. It's such a liberating feeling when you've conquered it. That day will come!