PLO $50 - Nut straight becomes 2nd nuts on the turn, very awkward spot

[YKMM]

I have $27.90 left. Villain is a 70/20/1.5 donk.

PokerStars Pot-Limit Omaha High, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($179.35)
Hero ($57.15)
Button ($47.75)
SB ($12.75)
BB ($112.65)
UTG ($39.90)

Preflop: Hero is CO with 8[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to $1.75</font>, Hero calls $1.75, <font color="#666666">1 fold</font>, SB calls $1.50, <font color="#666666">1 fold</font>.

Flop: ($5.75) 4[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $5.5</font>, MP calls $5.50, <font color="#CC3333">Hero raises to $27.5</font>, SB ca+lls $5.50 (All-In), MP calls $22.

Turn: ($71.75) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>
<font color="#CC3333">MP bets $68.75</font>, Hero ......