I think pretty much all of us had some level of hypochondria in early sobriety. I would be sure to let your theripist know just how bad it is, so they can focus further on it.
You can also ask about what other programs are available for you that you can attend in between appointments. I know at least around here they have a community center that has a ton of different classes daily for everything from anxiety, to dual diagnosis, coping skills, cooking, AA, pretty much everything. Good ol' AA is another solid location.
Lastly mental health medications like lexapro can take up to a month to start working, so don't give up too soon unless the side effects are severe for some reason, you can inform your doc and they can switch you to something else.