Gross spot with 9's

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Need an opinion on a 3/6 hand, live game. Game is quite loose (5-6 limpers on average), but hyperagressive when I sit down (tons of capped pots on the flop).

I'm in EP3 at a 10 handed table with 9[img]/images/graemlins/diamond.gif[/img] and 9 [img]/images/graemlins/heart.gif[/img]. EP1 limps, I limp, MP1 MP3 limp, cutoff limps, button limps, sb completes, bb checks. (literally 7 or 8 to the flop, if my memory is right).

Question: should I raise? (unlikely to thin the field by much, if at all)

Flop is 5 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]

Sb bets, bb folds, EP1 folds, I raise (???), MP1 calls, MP3 instant 3 bets, cutoff caps even faster, button calls (not sure on that one), sb folds. I call. At least 4 to the turn, maybe 5.

Turn: 5 [img]/images/graemlins/spade.gif[/img]

I check, MP1 checks, MP3 bets, cutoff raises, button folds, I fold (???), MP1 calls, MP3 goes all in for 13 total, all call.

River: 9 [img]/images/graemlins/club.gif[/img] (I throw up a little inside)

Results in white:
<font color="white"> MP1: 10 [img]/images/graemlins/spade.gif[/img] j [img]/images/graemlins/spade.gif[/img]
MP3: 4 [img]/images/graemlins/spade.gif[/img] 2nd card unknown
cutoff: 5 [img]/images/graemlins/diamond.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img]
</font>

Opinions? Simple pot odds fold? Players have been mostly straightforward in the game. I did not notice that MP3 had 13 chips left until after he was all in. I put everybody on about the hand they hand (one with a FD, one with either a flopped set or two pair, one with a straight draw or made straight). Should I raise on the flop? preflop?