I have adhd, and taking concerta. Doctor just asked about it and made a note. I passed the exam two weeks ago, without any questions from IRCC .I was nervous and anxious like you too but finished and passed my medical recently and see that all that worrying was for no reason. You'll be fine.
Don’t worry my friend, 15% of the population has adhd and it’s not a very expensive treatment. If they were banning people for this, many many people would fail their Medicaid!