I second what the others have said esp. bec_107. I yelled at my 8 month old the other day, "what;s the matter bubby?" as if she could tell me!! I have heard that sometimes the reaction they get from biting is so exciting they do it again. I actually say "uh!uh!" in a very sharp tone, and stop feeding her, only for a few minutes if she's crying.
He's NOT doing it to upset you, he's really not. Wait till he's two!! But again, don't feel bad, it's part of life and you are very tired and human. Just give cuddles say you're sorry, and forgive yourself. He'll have already forgotten about it!! It's horrible that these children that we long for and love so much sometimes drive us completely mental!