R.S.
Please don't bite him. :) You sound like one whose soft heart would especially regret it, and I'd hate for you to hurt there, too. I don't have unkind words for those who have tried it in order to help their deliberate biters, but your son seems to have a different issue. I would say to continue what you are doing now--noting related behaviors like the hands and toys in his mouth, screaming when it hurts, (what choice do you have?), and being patient. Also, continue looking for a source of pain. I would say he is reacting to something that hurts. It seems most likely that it is something like teeth coming in, but it could be somewhere else in his body. If this behavior doesn't go away in a few weeks I hope you post it again and mention that it has been going on that long. But I hope that you are well into the next problem by then:)