I relate to this. I am my calmest externally when I'm freaking out. Blood draws undo me. Mostly with the dentist I just fear the bill though. The numbness is always a bit fun, isn't it? Is half my face smiling? I think I will go take a look and see...
The numbness can be, and is an excuse not to talk! The bill wasn't and never is pleasant. I am hoping that after this I shall avoid big bills by going regularly!