I had an endoscopy when I was 16 years old. I told the doctor about my emet and they completely sedated me and gave me anti-emetics. I got knocked out really quick and when I woke up I was actually really starving. I didn't feel any n* after the procedure and I was actually quite mad since I couldn't eat anything large (just crackers).
Just let the doctors know about your anxiety, they will completely understand and do everything in thier power to make sure everything goes smoothly.
=)
AIM - r311dude (don\'t be shy, I love to chat)