to fold or not to fold? Or what?

[DeeJ]

Don't know either of villains, CO appears straightforward / reasonable, SB is rather loose but also plays aggressively, but can fold, post-flop. A bit LAGgy.

Anyhows, I'd been sitting there for 4 orbits getting no cards at all - Flops Seen 8%, Pots Won 0% - when I then lost trips to a straight, split a straight when we both had the nuts and lost 2 pair to another straight. So I was pretty sad.

When this hand arrives. Yet another dangerous board, yet another opportunity to spew chips. What should Hero do? (apart from maybe raise preflop?)

Paradise Poker 8/16 Hold'em (10 handed) converter

Preflop: Hero is BB with A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
UTG calls, UTG+1 folds, UTG+2 folds, MP1 folds, MP2 folds, MP3 folds, CO calls, Button calls, SB completes, Hero checks.

Flop: (5 SB) 3[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, UTG folds, CO calls, Button folds, SB calls.

Turn: (5.50 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, <font color="#CC3333">SB 3-bets</font> ...

Hero ... ?