My daughter has just started doing this. While bfing shed occasionally wimper or outright scream like she got stuck in the foot. The first time it happened I thought my duct cleared and the taste/texture of it upset her but she does it on my other breast too.
I DO have an oald but that usually just causes her to jump back and choke but would it cause this too? She pulls back slightly bit continues suckling thru it then calms down.
It's more disconcerting than when newborns cry in their sleep cuz of the Moro reflex.