Alright so I take the same stuff, going on and off can lead to some sever problems, I understand how you feel, I am 15, and, well, I'm not going to go into my problems, anyhow, if you would like to be taken off them you'll need to slowly decrease your amounts and take them daily, so do like, 100mg for 3 nights, then split the pill in half and take a half of that for 3 nights (50mg) then cut it in half again (1/4) and that'll be 25mg then continue on that for 3 nights and then go to like smaller amounts if possible. Or talk to the person who administered the Zoloft and they'll cut you down. Side affects can be serious, I forgot most of them due to the pill...But I know some withdrawal side affects can be serious.
Best of luck. <3