Keep your spirits up. Not all of us were meant to work at Starbucks. Focussing can be difficult when dealing with depression and can take a long time to come back even if you're recovering.
I'm with Randy and your medication. My sister was on Paxil and it didn't seem to be working. She talked to her doctor who upped the dosage and changed when she took it and she's doing great now.
Focus on the positive things your doing - like going to school and taking classes - and keep in touch