ADHDers have good days and bad days. Inconsistency in attention is hallmark. As is hyperfocus. It's not always so extreme, and a generally flexible child can snap out of it just fine. My Advanced and ADHD son hyper focuses (like right now) but doesn't have issues with reasonable task switches.
I wouldn't talk yourself in or out of anything - it's too easy and doesn't help anyone. I had myself completely talked out of my son's giftedness and ADHD. I was questioning everything. So I had him retested (IQ) while medicated for ADHD. The difference between pre-ADHD and post-ADHD meds was shocking! I'm not in denial anymore! Perhaps some follow-up testing would put your mind at rest and help guide your parenting and academic decisions?
