QQ, Lots of Action, New To Limit

I'm new to limit and am just trying it out to clear some bonuses. I had a few question about the action on this massive pot:

1.) Should I be raising this hand in MP
2.) I raised the other rounds because SB was opening. Is this correct?
3.) Why the hell would UTG (*EDIT*) call a 3-bet on that turn then fold to the J on the river?
4.) Am I overanalyzing this?

PS: I know I backed off at the end, but like I said, I'm new to limit. Plus I'm a little b*tch.

Party Poker 0.50/1 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP2 with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $0.50.
<font color="#666666">1 fold</font>, UTG+1 calls, UTG+2 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, CO (poster) calls, Button calls, SB calls, BB calls, UTG+1 calls, UTG+2 calls.

Flop: (14 SB) Q[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(7 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, UTG+1 calls, UTG+2 folds, <font color="#CC3333">Hero raises</font>, CO folds, Button calls, SB calls, UTG+1 calls.

Turn: (11 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, UTG+1 calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">Button 3-bets</font>, SB calls, UTG+1 calls, Hero calls.

River: (23 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, Button calls, <font color="#CC3333">SB raises</font>, UTG+1 folds, Hero calls, Button calls.

Final Pot: 29 BB