Should I have folded? If so, at what point?

NL $50 on Prima

2 limpers to me and I limp OTB with

SB min raises, everyone calls. 5 to the flop. Pot is $5.

Flop:

SB bets .50, BB raises to $2, MP2 raises to $3.50, 1 fold, I call, SB raises to $5 (is this limit?!), BB pushes all in $16.60, MP2 calls, I call, SB pushes all-in an extra $1, MP2 pushes all-in $34.50, I call.

If you can read through all that nonsense... thoughts?

I probably fold to the first round because there is a bet, a raise, and a reraise. At this point, I'm pretty sure you can't think of your Ace as an out and your call doesn't close the action so you don't want to play for a lot of money. However, once you start calling, I can see why you keep calling as you are getting good pot odds (i'm too lazy to do the exact math). However, I wouldn't get involved in this raising war with just a draw.

You are playing against 4 opponents and have a 1.8:1 chance of catching your nut flush. I like getting in here even though a lot of people may pass because you are not closing the action. In cash games you take your chances when the odds are correct and here I like to get in there because you have solid outs to the nuts except the 9s. What's even more inticing is that you are going to see it to a showdown without having to worry about odds on the turn. I get it in there and hope for the best thinking it's the correct play.