Hmm...
It is so unhappy hand for you...but..uff play on 10/20$ NL

It is amaizing...
I`m playing at 0.25-0.50$ and 0.50-1$ NL tables and I`m verry haapy when I win 100$ , but loosing 5000$ for me it will be tragedy
But what about hand...I think you played well...You had 3 kings in the flop and you was palying slow play game, it is only unluck for you. Don`t worry about it and you will get more winning hands with pocket kings!
Good luck!
Zenjuk