@goatsarah I have ADHD (not just from usual clinical diagnosis, but also ten years of prior counselling, as there will be replyguys saying it's a fad).
You're right about the terrible, terrible advice. It seems to come down to many people treating a neurological problem as psychological.
When you say that, people assume you're trying to get out of "trying" or avoiding blame, but actually it makes things easier to come up with strategies to beat it, 'cos the problem is simple and mechanistic.