My son (14 months) had surgery a month ago under general anesthesia. His reaction to it sounds different than the other two people that responded but it might be because he is younger. The nurse told me going into it that the babies are never happy when they wake up and I thought, not my baby he'll be great. :) Well, as predicted he was mad, mad, mad when he woke up. He was crying and it actually took about 20 mins to calm him. I started to tear up at one point too just because I knew that he was not feeling good. Anyway, I certainly don't want to scare you because once he was calm he took a bottle there at the hospital, and then once we got home he actually played with his toys before going down for a nap.
Because my son was younger they gave him "silly juice", basically a nasal spray that relaxed him. They did this so that he did not get upset when I had to give him to the nurse, fully awake. We were not there when they administered the anesthesia.
The only other thing I would share is that we could not see him right when he woke up. They had a recovery area and the nurse was with him and they said they would get us as soon as he woke up, but it wasn't their practice to allow the parents to be right there and wait for them to wake up. This was hard on me because I wanted him to see me first when he woke up. Your hospital may do it differently though.
The hospital we went to had small DVD players so my son was able to watch a video before his procedure. We did paperwork first and then they took us back and did his vitals and then they let him watch a short video while they made sure everything was ready. We took one of his favorite videos from home and he seemed to forgot where he was and just enjoy the show. :) If you have a portable DVD player or a laptop then I would suggest that you take that and one of his favorite DVDs.
I really don't want to scare you by any of my comments; I just wanted to share my experience so you can prepare. We had a month or so to mentally prepare for the surgery and even then I felt like I wasn't ready!
We'll be praying for a successful surgery and let us know how it goes! Your son is lucky to have you as his mom!!!