Hi MommyN,
it sounds like it could be related. Did you perhaps 'skrik' when he bit you and pulled back or jerked? Maybe your reaction gave him a fright in turn and he is now 'on strike'? My LG also went on a nursing strike once when I was still breastfeeding, luckily it only lasted a day (I still don't know what her motive was). I know how stressful it is though when they refuse the breast!
Another thing I could think of is that he has started teething? Could be an explanation for the biting and the boob refusal.
Here's some info about nursing strikes that helped me not to freak out completely when it happened to me:
www.kellymom.com/bf/concerns/baby/back-to-breast.html
Or call a La Leche lady?
Hope it's gonna go back to normal soon!