PL Hand - open ended with nut low draw and over pair

[Mr_Soprano]

$0.10/$0.25 - Pot Limit Omaha Hi/
MP1 ($18.75)
MP2 ($19.05)
Hero($30.35)
Button ($30.15)
Sb ($21.95)
bb ($22.90)
UTG ($11.70)
Villain ($59.60)
UTG+2 ($9.40)

Preflop:
Hero is CO with [3 [img]/images/graemlins/club.gif[/img] A [img]/images/graemlins/diamond.gif[/img] A [img]/images/graemlins/spade.gif[/img] 5 [img]/images/graemlins/club.gif[/img]]
UTG calls $0.25
Villain raises to $0.65
UTG+2 folds
MP1 folds
Hero raises to $2.55
button folds
Sb folds
bb folds
UTG folds
Villain calls $1.90

*** FLOP *** [Q [img]/images/graemlins/diamond.gif[/img] 4 [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/club.gif[/img]]
Villain checks
Hero bets $5.70
Villain raises to $22.80
Hero?

Is this a push situation? Opponent could have flopped a set or flush draw or both and could also have a low draw.