I was on Zoloft for several months and it didn't seem to be doing much for me -- other than making me a little shaky and sick to my stomach

So...anyone whose had experience with Celexa...DOES it work well for anxiety??? I did some research and as far as I can tell, it's mainly an anti-depressant that works very similarly to Zoloft. I've only been on Celexa a week so it hasn't really kicked in yet, but I'm feeling a little discouraged because my experience with Zoloft wasn't good and I REALLY need help getting a handle on my anxiety.
I was actually hoping my doctor would prescribe me Xanax or something specifically for anxiety/panic disorder but he refused and I understand it's habit-forming and all that, but like I said, my depression isn't really a big problem. My anxiety on the other hand is a HUGE issue.
I'm rambling, sorry. Hope someone can give me some insight into Celexa, and how it works SPECIFICALLY with anxiety.
Thanks ~
H.