Id fold here, but in retrospect I feel you should have played a litte more agressively PF and on flop.

4BB+1limper = 5$ (probably wouldn't change much)

and I honestly HATE betting 1/2 pot, even as a cont. bet, just because people are so inclined to stick around with draws. Hell, if I had an OESD or a 4flush and someone bets 1/2 pot into me on flop, I usually call if we have decent stack sizes. 3:1 ~ 4:1 plus this is NL to implied odds = your stack becomes mine when I hit

but yeah, fold