Tough river decision against unknown

[Barrin6]

Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 6 Players - (LegoPoker HH Converter)

SB: $190.00
BB: $325.30
UTG: $265.10
Hero (MP): $211.20
CO: $24.70
BTN: $0.00

Preflop: Hero is dealt Q[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (6 Players)
UTG folds, <font color="red">Hero raises to $7.00</font>, CO calls $7.00, BTN calls $7.00, 2 folds

Flop: ($24) Q[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">Hero bets $18.00</font>, CO folds, BTN calls $18.00

Turn: ($60) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $46.00</font>, BTN calls $46.00

River: ($152) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero ???????


Ok I have two questions.
what would you do here on river if you decided to check and uknown villain shoved?
Now how about 43/10/1.5 and who has a 20% fold to c-bet, how would you play and if check do you call a shove?