I was on zoloft for about 10 years (with a few lapses)... I think it really helped with the depression, although in my case I felt a little "numb"... like I wanted to cry but couldn't sort of thing. But, maybe that means its doing its job.
Zoloft has the least amount of side effects of many antidepressants... I noticed I didn't sleep quite as well when first starting it and some sexual "depression". Otherwise, no big side effects. I would recommend it. A friend of mine (no cf) takes it and LOVES it... She said its helped so much with her anxiety and everything... she's actually not depressed, just very very anxious.
I think as far as "un-depressing" yourself... I suggest maybe exercising. Even walking a bit everyday. I know this is difficult cause the tendency to sleep and feel sleepy and crummy is the norm with depression. But, exercising releases endorphins, which is the body's natural "feel good" medicine. Otherwise, I also suggest you have someone you can vent to. Being depressed is very difficult if you don't have a support system (its difficult WITH support, but even worse if you feel so alone). Be honest with people around you on your moods and how you feel so they don't feel you're just "moody".... that's one big thing I had to deal with. Once my parents/friends knew what I was dealing with, they were less able to hold things against me (i.e.... sleeping all day as lazy), etc. Just be honest with yourself and others and you'll be fine.
PM me if you want to talk further... I have 15 years experience with depression/anxiety.
Take care,