I went through the same thing to a lesser extent playing SNGs. I started playing them 6 months ago and I've moved up twice. Each time I started at a new level I would be real nervous/excited for about the 1st dozen tournaments. It was like somewhere in the back of my mind I had this feeling that the skill jump was going to be huge and I was going to suddenly have a streak of like 20 OOMs. Finally, I realized I was being silly. The skill difference wasn't that big and my bankroll was adequate, so the worst thing that could happen was that I could start the new level on a real cold streak. If that happened I could always move back down for a little while and try again, but it never happened.

Of course, nothing says you have to move up, but from your post it sounds like you want the challenge. Just remember you can always move back down for awhile if things start out badly.