Just spoke to my sister in the UK. She had a tooth mis-growing right at the back of her jaw, and was only viewable by x-ray. It caused my sister a lot of pain.
She had to have an operation which involved her havig her jaw dislocated so they could get to the rogue "tooth". My sister is allergic to local and general anesthetics, so, the doctors had her hypnotised.
She was fully awake all the way through the operation. They dislocated her jaw, drilled and removed the tooth, let her lie down for 30 mins after and then she went back to work.
She felt nothing.
That's pretty mental, i beleive in hypnotherapy, but didnt realise it could be used in operations.