Your hand is not good enough to be opening in EP. You can limp, but you are really only playing the AKs, with 2 danglers that add very little equity unless HU. In a FR game, you should generally open fold this hand, although a limp in a passive game is ok.
In a 5 way pot with that kind of action in front of you, you have completely missed the flop. It's basically an auto fold here. Peeling off a card here is only good if its extremely cheap, and if your stacks are deeper. Calling 500 essentially makes it a low SPR hand, and you are basically calling for a single out on the turn, the 2d. This would be the only card that really justifies you continuing, although its not even the current nuts.
I would have liked the fold preflop, or the flop. As played, I'm not sure why the tank was necessary if he bet 3700 and you have 4500 behind. Nobody is folding for 800 more at this point regardless of what they currently hold.
Drawing to so many non-nut outs multi-way isn't usually a good idea.
I was playing a low limit PLO game last month (10-20) with a lot of money on the table. I open for the pot (70) with Ad Kd 3s 5s I got re potted by the guy on my left to 240, 3 others call and I call (5way action) Flop comes 5d 4s Qs... I check the guy on my left bets 500 and the the other 3 call again and I call.. Pot is now 3,700 total and I got 4,500 left... turn is 7c... I checked and the guy on my left pots.. 1 guys mucks the others call.... I tanked!!... I will tell you all what I did and why.. What would you have done at this point...