[drewjustdrew]

For the size of the pot, I would go all-in, or fold. Most likely, I would go all-in. I would be nervous for AA like you were, but he could just as easily have qq,jj, or tt. No matter what, your opponent played the hand horribly and got lucky. Even after the flop, he should have folded to your raise, saving the last $4000.