Today was my first meeting with psychiatrist. We talked about 10-15 mintues about my background and what it is troubling me.I tried to be honest with him and explained my issues like the places that I have had panic\anxiety attack and my lifestyle. After the session, I showed him what my GP have given and he basically told me to come back to see him in two weeks.
I've had 2 first meetings with psychiatrists and both times it lasted at least an hour and a half. I also had to fill in questionnaires to take to the appointments. At the end of the session the psychiatrist told me what he thought the problem was and suggested a choice of therapy or medication.
Maybe he was happy with what your GP had given you or maybe the next meeting will be more thorough.
I'm sorry I can't be more help but that's my experience.
Make sure you ask him all the questions you need to until you are happy with everything.