Strange raise - what to do?

[Ole16]

Party NL 400. Full table.
I have about 375 and villain´s got me covered. No reads just sat down an orbit ago.

I have 4 [img]/images/graemlins/heart.gif[/img] 4 [img]/images/graemlins/club.gif[/img] on the button 2 callers in MP before me and I limp in. Sb completes - 5 to the flop.

Flop: (pot 20)

A [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/diamond.gif[/img]

Villain bets 10, MP calls I raise to 30.
This is where it get strange [img]/images/graemlins/blush.gif[/img])
Villains pushes about 500 into the pot?????
MP folds - hero... ????

I´ll post thoughts/results later.

Sorry but the manual HH - cant do it otherwise.
Thx in advance.

/Ole16