I awoke from having all four removed as a teenager (smarter people have to have them taken out early doors you see) feeling only groggy, no real pain whatsoever. Possibly because I was pumped full of pain killers.
They gave me an entire 5 minutes to recover then basically forced me out to the car where - whilst sat next to my mother - I vomited up a good size bag worth of blood. Apparently you swallow like a litre of blood or something as your sat there.
Enjoy!