Had a horrific session last night. Played two 1/2 tables on Captain Cook, and found them very tough. Several tight aggressive players, lots of aggressive postflop play, 3-bets preflop most hands. I ended up dropping $100 in an hour or two. I don't think I played that badly, and I certainly had a bad run of cards - but the crucial mistake was not getting away from tables that don't look profitable. One of my major leaks is that I try too hard to dig myself out of a hole instead of just stopping.
I must learn the lesson of bort: table selection is the number one priority..