That definitely sounds familiar. Consistency is a big issue for me, not so much in terms of grades but in other realms of life - or even class discussions. Some days I'm "on". I'm even funny. Perhaps it takes a ton more energy, but I'd like to think that's the "real" me. Other days, I'm just a lot slower or awkward or somehow different from my better moments, and that sort of inconsistency bothers me (and probably confuses others, too). I'd like to think I'm capable of certain jobs, but consistency has been a big stumbling block - Not submitting the same quality work as yesterday, or not being predictable in the chatter in the teachers' lounge (for example).