Variance? After how many buyins do you decide it is not a downswing?

[skates]

Serious response: You say you are not playing great. Even if you don't think your game has changed moving from 50NL to 100NL, it probably has. Check poker tracker if you have it. Step back down or take a few days off then give it a clean shot. If you can beat 50NL, you can beat 100NL. Confidence is huge. I was up 30+ buyins at 100NL before going on an 11 buy-in downswing in some 5k hands (I don't have a graph, sorry). I still can't figure out what I was doing differently, and it just seemed to pass, but I know I was wayyyy less confident in my play then than I am now.