During the past few days, I think external frustration has put me on a sort of tilt that has me making very bad plays. I'll know I'm beat and yet still pressing the 'call' or 'raise' button though there's no way I'm going to get him to put it down and I've only middle pair, or some such. I'm making very poor decisions that I know are bad decisions, and yet I'm still making them.
This isn't happening all the time, occasionally I can focus and think only about the game or about other things and then I do well. But when I let frustration seep in... that's the end.
So I think taking a week or so off (from playing) might be the best course of action (although I'm still going to be reading these forums :))