My first bit me on and off for almost a year (sorry! :( )
I finally cried one day b/c he bit me so hard and he never did it again. I think it scared him to see me cry.
It could be that his teeth feel weird now, he's trying to get used to how they feel in his mouth.
Here's what we did with kids 2 and 3. Every time they bit I ended the session. Just for a minute, but they quickly figured out that biting = no nursing. Remind him to open really wide BEFORE he latches on, that has really helped with all of mine. If you are kind and consistent, but still firm with the fact that he cannot bite you, that will help.
You could also try having something on hand ( a teething ring, soft toy?) that he could chew on. Offer that when he bites and tell him he can bite this, but not mama.
Good luck to you, I remember how frustrating it can be.
Anno