I would not worry about the new Doctor. The Doctor will talk to you about your mental health history and then will explain the different options of treatment and talk about the AD drugs. Some anxiety is always normal when you go to a new Doctor or in my case to my regular Doctor.
Be sure you ask about side effects and what to expect if the drug does not work. Also how long before the medication will kick in.
You don't even have to put on a gown with no back.............:)