$5+.50 Stars Rebuy Noob Question

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I have played quite a few MTTs in the past year, however I just recently started playing stars tournies where the stacks are MUCH deeper. The following hand came up with blinds of 200/400 and a small ante (50 I think ? not sure). We are still pretty far from the money at this point

Hero approx 20,000 in chips
SB approx 40,000
UTG+2 800

UTG+2 goes all in, I call in the CO with 66, SB calls, all others fold

Flop is 6 [img]/images/graemlins/heart.gif[/img] Q [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/heart.gif[/img] (pot 3000)

At this point there is no side pot

SB checks to me, I bet 2,000, SB checkraises to 11,000, I go all in

My question is how do you respond to the SBs huge check raise ? Is my play here appropriate ? The whole side pot issue confuses me.

Thanks