Jillann, I hope the fog will go away. I think it's just your body/brain getting used to the new chemical guests
I'm not on Celexa or any other antidepressant now. Over the last 15 years or so, I've tried Prozac, Celexa, and Cymbalta. I liked Celexa best, because I felt more like myself on that than on the others. Prozac made me kind of "speedy"--did not feel good to me. So, for me, the beginning side effects with Celexa were nasty, but then I liked the overall, long-term effect of the drug better.
Another potential plus: Celexa had fewer sexual side effects--i.e., did not kill libido or sexual "response."
Hang in there and maybe give the Lexapro another week to prove itself?
RabbitEars