I've only tried it on the lowest dose and for a few weeks to a month. In that time, I also added something for ADHD. I'm convinced it was the latter that threw me into mania (hypomania), but it could have been both.

Still, I loved Zoloft! It really helped my depression and if I was at any loss of appetite, it was mild. The med for ADHD gave me bothersome stomach aches though, which went away when I stopped it but not the Zoloft.

Sorry it's not so good for you. Maybe wait a few more days and see if it passes, but otherwise, probably try another AD.
oh yeah, and it might help to take in the morning if it keeps you awake at night. I took in the morning and always with food.