Help on a hand?

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I was playing a 10+1 SnG at party, blinds were 200. I was on the BB with T800 (about 5th out of 6)
Cards are dealt I get a Q5o (don't remeber suits)
LP limps, SB completes and I check.

Flop
Qd 5c 7d

okay, here is where I want advice....
I open with the 200 bet with the thinking, I have two pair but a flush draw possible, no free cards, but am hoping an overcard will chase. LP limper calls (T1100) SB folds (one down!)

turn
9d

I bet another 200, again worried LP has a flush draw(now worried about just a high diamond, no freebies, they call. Which makes me think no bet no flush yet.

river is a blank, I have <200 and push it in, since the LP never raised to me, they call and.......

LP has 68d I'm out

Any suggestions as to mistakes or better ways to play? I suspect i should have pushed with the two pair and stolen blinds and the LP call to live and fight another day, but hindsight is always 20-20 [img]/images/graemlins/grin.gif[/img]