troubling hand

[shockg]

First post here... playing 10/20 short... I got QQ and am UTG, I raise, everybody folds but small blind who limps in. Flop comes 9s, 3h, 6c. I bet, he raises, etc until I cap. Turn is 2c. Capped again. Now I'm thinking he has a bigger pocket pair or 2 small pair. This guy has been a maniac all day and I'm thinking he has no better than a 96 probably only a 9. River comes a Q giving me a set. We cap again. Turns out he had 45o and made a straight. How else would I play this hand or was this just a bad beat?