I'm sorry your doc isn't helping you out...I wonder if the office has a nurse that can help? Some offices have nurse case managers/nurse liaisons whose job it is to help out with things such as this. They deal with insurance companies all the time and would understand how to navigate this better I think than your doc would. Not all offices have them (I see them more in the hospital); nurse liaisons especially are kind of a newer thing. But it may be worth asking about this.

Dealing with insurance is definitely not easy, and causes anyone anxiety. I can't imagine trying to navigate those waters with GAD. Stay strong, and good luck to you!