you did really well on calling your insurance company! i totally DESPISE making those types of calls. find them utterly stressful. so good job! that is out of the way. now you know how to go forward.
i am sure your pdoc will be able to take care of you on the authorization, and can keep you in samples in between.
they are probably used to this insurance thing. i poked around some, and i see that other folks have run into this needing-auth bit, because Lexapro is essentially refined Celexa which is available in generic. but it was refined for good reason and
with good results. Many folks are side-effect free after they adjust - not the case with Celexa. Your doc knows this, and is scripting Lexapro - i am sure he will fix it for you so you can have the Lexapro if it works out for you.
i really encourage you to give it a good go though, even if it means going to 5mg at first.
~ waves ~