what are your temps? does he thermoregulate - switch between hides/sides of the tank when he gets too hot or cool? what's your humidity after the auto-mister mists? it mists how often?
there was another former who posted a vid of his BP heaving deeply, but that was it's whole body. not just the face. He took it to the vet after a day or two, and there was nothing wrong physically and the BP returned to normal. it was just a weird occurrence.
i hope others will peep in for u. just monitor him for now and make sure temps/humidity is on point to keep him comfy.
edit: here's the heaving thread - http://ball-pythons.net/forums/showt...t-Feed-Heaving