flopping second nuts

[sublime]

overcaller appears to be a solid winning player, which obv scares me this hand. still can i do anything differently?

flop raise is 20/7 over like 1500

Full Tilt Poker, $1/$2 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

UTG: $331.90
MP: $252.85
CO: $230.05
BTN: $200.50
SB: $733.60
Hero (BB): $200

Pre-Flop: J[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
UTG folds, MP calls $2, CO folds, BTN calls $2, SB calls $1, Hero checks

Flop: ($8) 3[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (4 Players)
SB checks, <font color="red">Hero bets $8</font>, <font color="red">MP raises to $16</font>, BTN folds, SB calls $16, <font color="red">Hero raises to $72</font>, MP calls $56, SB calls $56

Turn: ($224) 9[img]/images/graemlins/heart.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $126 and is All-In</font>