If you try a few more antidepressants and they make your anxiety worse, you may need a mood stabilizer instead. The same thing happened to me. Everyone is so different. Effexor and Wellbutrin all have a stimulant compentent to them but still seems to be helpful for some people with anxiety. For me and a few other people I know, those two make them feel worse. Again, everyone is so different. They may really help you.
Paxil and Zoloft are commonly used for anxiety. Zoloft and Lexapro, however, are very similar in their makeup so perhaps that wouldn't be a good choice for you.
The trial and error thing is so frustrating, but once you get on the right medication you will feel much better. I commend you for trying the other alternatives before trying medication!!! That is wonderful.
I hope you really get to feeling better soon.