Big raise, fold or insta-shove?

[M1cKmAcK]

4.40/180. 3rd level. I know I misplayed this hand horribly by not raising flop, now what do I do?
PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Hero (t2931)
UTG (t684)
UTG+1 (t2345)
MP1 (t4165)
MP2 (t5040)
CO (t3415)
Button (t1100)
SB (t6535)

Preflop: Hero is BB with , .
[color=#666666]1 fold</font>, [color=#CC3333]UTG+1 raises to t200</font>, [color=#666666]4 folds</font>, SB calls t175, Hero calls t150.

Flop: (t600) , , [color=#0000FF](3 players)</font>
[color=#CC3333]SB bets t50</font>, Hero calls t50, [color=#CC3333]UTG+1 raises to t550</font>, SB folds, Hero?