AKs in the middle stages

[gehrig]

30+3 MTT on Pacific

Blinds 200/400
I have ~10,000. Somewhere around 5th. ~35 people left, top 30 get their buy-in back
BB has me covered by a few hundred

I'm dealt AKs UTG. I raise to 1200. Folded to BB who calls

Flop is AJx. Two hearts, my cards are diamonds.

BB checks, I bet 2000, he minraises. What's my action here?

I called, for reasons unknown to me. I know that was the absolute worst thing I could do. I folded to his turn all in.