nut flush on turn he check raises me 200 NL

[docnuclear]

I'm playing 21/16/2.6, he's 22/12/3 no reads, none of us has been out of line.
Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $105.35
BB: $158.00
UTG: $88.50
CO: $188.30
Hero (BTN): $199.00

Preflop: Hero is dealt J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG folds, <font color="red">CO raises to $7.00</font>, Hero calls $7.00, 2 folds

Flop: ($17) 8[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">CO bets $8.00</font>, Hero calls $8.00

Turn: ($33) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
CO checks, <font color="red">Hero bets $22.00</font>, <font color="red">CO raises to $52.00</font>
I'd like a river plan as well...