My almost 11 month old is cutting his fifth tooth. Normally through this he is fine with nursing, even nurses more typically. This afternoon he started biting down on me and pulling away. I've tried several times since then and he wants to nurse but bitesand then pulls away. I gave him advil and tried a cold teething ring,none of which has helped. I'm at a loss. He did take some pumped milk in a cup today but i don't want that to be the new normal. Any suggestions or encouragement?