Andrew, you need to read the book "Driven" by Douglas Brackmann and Randy Kelley. You will quite likely find out that the book describes you well. If I'm guessing right, you are one of the "driven", people with certain genes expressed differently from 90% of the population. ADHD is just one of the possible visible symptoms, there are certain other markers that are important (some of which you exhibit: you are a founder/entrepreneur for example).

Give the book a try. It changed my life (and I don't say that lightly). If I'm right, it might change yours.