There's a common misconception with ADHD that the treatment plan is:
Go to the doctor
Get a diagnosis
Take medication (and somehow remember to take it every day!)
Voilà! ADHD SOLVED!
And you don't need a medical professional to confirm for you that you're neurodivergent — if you're self-diagnosed, you can start working with your ADHD now (and in fact you are, since you're here putting the work into this very course).