I find that a bit of conversation helps a lot, it's surprisingly hard to think, talk, be anxious and try to figure out what that sensation in your arm is all at once!
Remember that every person who lays up on the couch is basically bricking it for some reason or another, you are not the only one, and I'm sure he's seen worse Besides, there is nothing bad to expect from this appointment, just a shortlived ache - which only kicks in for a while when the anaesthetic is worn off.