Yes but i'm not sure if you can get medication. Go ask your school nurse that question, as to depression itself yes you can, go to your guidance office and speak to the school therapist, ask her what services are in your area that may be of assistance to you.
Also remember the basic princibles of depression, try to spend as much time in areas with people as you can, even if you don't know them, get lots of sun or at least light, and exercise regulary.