Your experiences are basically textbook adhd. As someone with a profoundly gifted IQ and combined-type ADHD, let me assure you that not only is it possible to be intelligent and have ADHD but it's actually more common for gifted people to have a learning disorder, developmental disorder, and/or mental illness than someone with an average IQ. Your doc is dead wrong if they think you can't have adhd while getting good grades. When I got diagnosed with my many learning disorders, the school board didn't want to give me accommodations in school because I was getting As and Bs in all my classes, but the typical learning-disabled student was getting Ds or lower. What they didn't know at the time, though, was that most kids in my class could complete their homework in several hours, whereas it took me much longer because of my LDs. Just because you can do it doesn't mean you should be forced to take way longer than is healthy to complete your work or face getting a low grade that doesn't indicate your actual understanding of the curriculum. If you need medication and/or accomidations in order to fully show what you've learned, your doctor should help you get those. It's not fair to expect you to work 5x as hard as everyone else just because some lousy doctor won't consider the possibility that you are both smart and adhd.