OP didn't report trouble getting someone to believe they have ADHD, they reported indecision and difficulty identifying someone who offers treatment and arranging an appointment.
As someone who did get diagnosed: It took me _five_ attempts to get all the way to an appointment with a psychiatrist (inability to find a suitable psychiatrist, lost referrals, missed appointments etc). Navigating the medical establishment with untreated ADHD is hell. Now I've got treatment for it, I could do it easily, but it's really hard to overstate just how non-functional you can end up.
Because the symptoms are easily faked, I needed a significant range of retrospective evidence - quotes from school report cards, interviews with my parents - which I had to arrange prior to assessment. If I hadn't been able to produce those, I likely would not have been able to get treatment.
As someone who did get diagnosed: It took me _five_ attempts to get all the way to an appointment with a psychiatrist (inability to find a suitable psychiatrist, lost referrals, missed appointments etc). Navigating the medical establishment with untreated ADHD is hell. Now I've got treatment for it, I could do it easily, but it's really hard to overstate just how non-functional you can end up.
Because the symptoms are easily faked, I needed a significant range of retrospective evidence - quotes from school report cards, interviews with my parents - which I had to arrange prior to assessment. If I hadn't been able to produce those, I likely would not have been able to get treatment.