I'm glad your little guy did well with the camera. Our DD has only had tubes put in, but it was still a nerve-wracking experience for us. Talk with your ENT about what to expect on the day of the surgery since every place is different. We have friends who were able to go into the OR with their son until he was put under. For our DD, we were at a different hospital and we weren't allowed to go into the OR. Instead, the nurse anesthesiologist took her in. Before that, she received a dose of Tylenol with something in it that made her seem drunk - she giggled for 15 mins straight before getting sleepy & cuddly. It was nice that she didn't have any idea of what was going on because I think otherwise, she would have been upset to be handed over to a stranger in a strange place.
Will you meet with the ENT again before the surgery? Our DD had an ENT appt. 3 days before her surgery and we went over everything then. If you aren't meeting with him/her before the surgery, just call their office and ask them to go over what to expect both pre & post op. Good luck!!!!!