What should I do about my depression?!

I'm a little bothered because I think that I may have depression. (maybe moderate depression?) I had brain surgery two months ago and have been recovering. I didn't start to feel somewhat normal until a few weeks ago (my short term memory just recently came back).

Should I take some medication/talk to a doctor? I really don't know what to do. My biggest issue is I feel very isolated/miss school/my old life. (I'm on med leave.)