pre-flop. I wouldn't re-raise to 3 with AJo. Maybe to 1-1.5.

flop- this is kind of tricky.. You did make a huge bet preflop, so the guy who had Q9 is just bad. but you have to be worried about KQ AQ or whatever else. I would probably bet 2/3 the pot and hope that a scare card didn't come. Then again, you are low stacked already and it's not gonna cost u that much to finish the hand. So you're pretty much committed once u bet strong at the flop. it's up to u 2/3 to pot sized bet tho.