I started taking
Zoloft about a month ago and went through a period of panic attacks, jitters and racing heart. I also take
Xanax and took a bit more during this time. These all seem to be side effects of the Zoloft, as is your upset stomach (which, amazingly I did not have). I've done a lot of reading about all these symptoms with Zoloft.
Try to hang in there with it and hopefully the side effects will disappear as your body gets used to the medication. Mine are almost gone after 5 weeks, and I feel loads better mentally. Still taking the Xanax, ususally just in the evening.
Best of luck to you!