I make sure the pinkies are fully defrosted, there has been no problem, until last night.?

the balcony was left open while i was at work, once i got home realized the room temp was cold and the snake was freezing. i put on the lamp and waited to see if it warmed up.onced i saw life in it, i called the vet to make an app..the snake then started drooling once i picked it up, body was warm. there seemed to be a few black spots on the belly and neck area. the snakes body tightened up and he flipped over after awhile, also blew a bubble. there seems to be no life left in it, and im uming its officially dead. and i cant see the damn vet until 12:30..but by now it seems pointless ;o( what are those black marks, the magically appeared today