I just play with a huge bankroll in comparison to the stakes. I'm very comfortable playing 600nl where the swings are almost irrelevant to my BR, rather than 1k nl, where although i'm am almost definately a solid winner, i don't feel comfortable losing 5k in a day. I used to also go on an emotional rollercoaster, and although my play really wasn't affected very much by it, it sucked. Now i just dont' care and the only thing that happens to me when i go on a real bad run is i start laughing.