I started taking Prozac again after being off of it for a little over a year. I've been on it for about a month and a half to treat my anxiety. A few days ago my doctor switched me to Zoloft due to my complaints about my emotions being too flat and my brain getting foggy. I'm on 25mg of Zoloft for 2 weeks and then can take my full 50mg dose. I was instructed to just quit my Prozac cold turkey. Now that I'm on the Zoloft I have been feeling sick to my stomach after taking. I can't concentrate on anything for very long anymore and can't fall asleep at night due to racing thoughts. Will these symptoms end? And will the Zoloft be similar to the Prozac?