I know that you just started taking Zoloft, and from your recent posts I doubt if you are on a therapeutic dose yet, that being 50 mg for this SSRI anti-depressant. Also, many people with anxiety disorders find that it takes 100-150 mg of Zoloft to obtain good anxiety relief. I have a friend of mine that is on 200 mg.
Anti-depressants don't work like other medications that you may be familiar with. When you take an aspirin for a headache, you expect to see some relief beginning in 30-60 minutes. Anti-depressants work by stimulating the growth of new brain cells and their connections, in the hippocampus region of the brain. Brain cells in the area can become damaged or destroyed by stress hormones such as cortisol. Once you reach a therapeutic dose, that being at least 50 mg for Zoloft, one usually sees degrees of improvement between 3 and 12 weeks, and beyond.
Since you were on the maximum dose of Celexa for such a long time, and felt it was not very effective for you, I fail to see why your doctor wants to switch you over to that. The Zoloft is barely getting into your system, hasn't had near enough time to work, and is showing you normal side effects at this point.
I am also very puzzled that your psychiatrist would tell you that the side effects of increased anxiety, insomnia, and loss of appetite, are not normal when starting an SSRI anti-depressant. These are "classic" symptoms of starting an SSRI. I had them some six months ago when I started a new anti-depressant, and they lasted some 2-3 weeks before rapidly diminishing.
I hope this helps to answer your questions Drielly, and put your mind at ease.
The very best to you!... Chuck