Hang in there, N.!
I've been nipped a few times over my many years of breastfeeding experience--once I remember in particular feeling very suspicious and (dare I say it?) even angry at my little nursling for inflicting such awful, unexpected pain!
But, I got over it.
It took a few days, but eventually things were OK again.
A very wise friend with more children than I have told me she thinks breastfeeding is a mother's first opportunity to teach her child to have good manners. When my babies get big enough and old enough to start wiggling around and possibly exposing me, I tell them I have to keep my hand on the edge of my shirt, right by their face. That just becomes part of the nursing experience, mainly so I can pull my shirt down if I need to, but it's kind of sweet when my baby will put his hand on mine while he's nursing. After that one bad bite, I made a point to keep my hand nearby even closer to my nipple, just in case I started to feel any clamping, so I could quickly un-latch. I never did, but having my hand there reasurred me for the few days I was tense about breastfeeding.
Babies cannot nurse and bite at the same time, as breastfeeding is a tongue action and the tongue must extend over the bottom gumline/teeth. Most babies will not bite again once they realize it causes problems and abruptly ends an otherwise pleasant nursing session.
Use breastfeeding as a baby-occupier while you check email, etc., sparingly, so baby does not feel compelled to get your attention in unpleasant ways! It's OK to do this, of course, but interact with baby enough that he doesn't feel like you're gone from the neck up.
Non-nutritive sucking at the breast is healthy and normal. As he relaxes after a meal or snack, his sucking pattern changes and becomes lighter, but it is still soothing and developmentally appropriate for him. If you are confortable snuggling him, you don't have to stop this unless you want to. However, if he would like interaction and direct attention, and you are passively nursing him, he might be more likely to try to get your attention. This is when it's nice to have your hand nearby.
Consider contacting your local La Leche League group. Their meetings are fun and informative and you'll gain tons of insight into nursing a baby with teeth. You can find your local group at www.lllusa.org. They have saved my sanity many times!
Congratulations on your breastfeeding relationship, and best wishes!