Don't know anything about this, but I've got the worst darned teeth in creation and never had anything like this happen despite my anxiety problem. I just don't want people reading this and getting anxious that this is a common experience, as I really would notice if it were.
Yeah I'm sure it's not something that would happen to everyone. My body is very sensitive to stimulants like caffeine, ephedra, and epinephrine so I'm sure that has a lot to do with it.
I have to make sure when I take cold medicine it doesn't contain pseudoephedrine because it will raise my heart rate and make me all jittery and anxious.
But that's what I meant -- I don't use those types of things either, but I've had a lot of novocaine shots and never had an anxious reaction to it. Never had nitrous, though.