I believe for even a third-class medical a pilot needs to be off ADHD medication for over 4 years, with additional screening/testing involved if they have been prescribed. My knowledge is limited since I have never been prescribed such meds and only realized I have some level of ADHD due to my son getting a diagnosis. He only took the meds for a year or two in elementary school before he opted to stop due to side effects and his brain overcoming that developmental hurdle.

It sounds terrible, but my advice would be that unless your ADHD is severe enough to demand medication you should never ever tell an Aviation Medical Examiner or standard doctor about ADHD suspicions if flying is something you want to do. I could technically still go fly if I found the time, and have never felt I was distracted given the degree that flying a plane engages all parts of your brain.

There is a dark side to this way of thinking though, as any sort of deviation from the norm with mental health or cognitive performance is often pushed under the rug instead of being treated due to fear of losing livelihood. A tragic example was Germanwings Flight 9525.