Online versus Vegas success - thoughts?

[meshuggah]

Been playing for 6 months. Serious student of game. Read WLLH and SSH multiple times each. Have been winning steady at .25/.5- and .50/1 online (earning $3/hr). Went to vegas this week and played 1-3 at Excal, 2-4 at Monte Carlo, and 1-2 at Luxor. Played about 10 hours over two days. I played tight and aggressive, did my best, but got killed. I just could not figure out what I was doing wrong - if anything. Anyone else go to vegas and get clobbered at these low limits? I couldn't protect a hand to save my life, had 3-4 people seing the river with me always when I was in a pot, I'm getting drawn out on constantly by drunken fools. Did I just get a serious run of bad luck/cards (on flop and post flop) or what??? Any thoughts - similar or different stories? thanks