I think it is a little early to think the Lexipro caused your anxiety since you just started taking it. That doesn't mean it will necessarily work for you when it does get in your system.
I took Lexipro and I believe it made me mean. I'm usually a doormat for everyone and while I was on Lexipro, I was able to stand up for myself. That wasn't necessarily a bad thing, but I wasn't doing it in a diplomatic why. It was more like an explosion of anger. I do know others who take it and do fine on it. Everyone is different and the way these drug affect people are different.
I also have taken Zoloft but after 6 months or so, it worked almost too good. Nothing bothered me including missing deadlines and other things that I needed to bother me to keep me motivated.
I'm currently on Pristiq and love it. One of the positive things about it is it does not make you gain weight. That's always a plus.
Good luck, B.