It shows you're not a doctor, but you're right: it's complicated condition (maybe even "configuration") and on top of that it's hard to diagnose in adults, because they tend to have formed habits around this condition.

There's a crude test though: Take (a small dose) of Ritalin, Adderall or other stimulant that increases activity in the striatum and see:

* Do you mainly feel sweaty, agitated and super-alert: probably no ADHD.

* Do you feel like you're able to think properly for the first time in your life or get sleepy even -> hints to ADHD.