Huge pot odds good enough for backdoor draws?

[luckydonut]

Party Poker 1/2 Hold'em (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP2 with A[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, <font color="#666666">1 fold</font>, SB calls, BB calls, UTG+1 calls, Hero calls.

Flop: (15 SB) K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG+1 checks, Hero checks, <font color="#CC3333">CO bets</font>, SB calls, BB calls, UTG+1 calls, Hero calls.

Turn: (10 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG+1 checks, Hero checks, CO checks.

River: (10 BB) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, UTG+1 calls, Hero ...?

My flop call is questionable: one overcard and two backdoor draws but with huge pot odds. The overcard is very likely not good against a 3-bet pre-flop who comes out firing again, so is 19-1 good enough on the backdoors alone, especially as the board is paired?

So then I hit almost perfect, but possibly disasterous, cards on the turn and river. I feel certain that had I hit the flush or a straight without a flush possibility, I'd be raising here, fearing only a very unlikely full house. Apart from JJ in the small blind, I don't really see it.

Do I have any reason to fear a flush here from SB, BB or UTG+1?