Well, he's started again. The teething stuff helps some, but some of it appears to be he's biting down when falling asleep (hard to know what to do about that; if I pop him off too early, he relatches, so it's basically luck of the draw if I time it right -- when he won't relatch, but hasn't bit yet). Some of it, however, is apparently him communicating he really doesn't want to nurse right now. Which is incredibly frustrating all around when he's exhausted and cranky, but doesn't want to just nurse to sleep.
We watched some Tubbies and took a bath and eventually he was able to settle in, eat and sleep.
He has also developed a habit of dragging his teeth across my nipple. Grrrrr. And then when I jump (duh), he bawls.