On the second day of school, my 12-year-old cut his knee badly exposing the tendons. The doctor said he had to really pump him full of anaesthetic as it was so bad. The effects seemed to really throw him out. Instead of getting physical though as he would have a few years ago, he brought it into himself. He just sobbed his heart out and couldn't talk. He had very bad headaches and the shakes. He slept non-stop for about two days before we started getting him back on track. At school the teacher said that my son had been so happy before but after his accident he turned into into a sullen, seldom speaking young lad. - by email, Qld [Local including dental anaesthetic injections usually contain preservatives that can cause worse problems when injected than consumed by mouth. It is possible to get preservative-free local anaesthetics if you ask - S]