I had a similar problem in moving from 3/6 to 5/10 limit. It took me 3 times to get here and stay here (hopefully

). Do what Brian said, and set a loss limit though. You won't get there

, but do it anyway.
Then you have to just buck up and play your game. I'm not going to retype RD's comments, but if you can't play your game, move down.
But, I suggest you give it another shot. Don't move down yet.