[angst]

Almost everyone goes through this. You just have to force yourself to continue playing with the increased stakes until you get conditioned. I remember moving up to $5/$10 6-max only a few months ago. I was scared as hell, but after a little while I was conditioned and $5/$10 was the new $3/$6. Now I feel about $10/$20 as I felt about $5/$10 back then.

It is just a matter of getting used to the stakes. Everyone goes through it. Force yourself to continue to play there as long as you are adequately bankrolled. Not moving up when you have both the bankroll and knowledge necessary is just bad management of money.