I was on Celexa for a while for depression/anxiety. It killed my libido flat and eventually made my anxiety worse.

I switched to Paxil. For a while (about a month, I think), my libido was a complete zombie. After that, however, it gradually came back.

So, first off, talk to your doc about it and see if s/he thinks sticking it out will make you level off. If not, and it really bothers you, I'd say ask to be switched to something else.