> Go find a good psychiatrist, ... who will give you a proper ADHD assessment and with whom you can work on medication if needed. ...
As one who does the assessing, I'd endorse your advice. It is of utmost importance to rule out concurrent conditions, but it's a fact that "comorbidity is the rule, not the exception". These other conditions like depression, anxiety, sleep disorders, etc., need to be addressed to really solve the problems.
> ADHD assessment takes at least few hours ...
That's actually an understatement. It may take weeks, months, even years to adequately understand a person's experience and the nature of dysfunction. In this clinical context, there aren't simple tests that reveal the subtleties involved in human behavior, thought and emotion. It requires careful observation, and collaborative communication between the healer and the sufferer to accomplish the task.
It's kind of like software development, an incremental process filled with tweaking parameters and testing the result. Usually over time we arrive at a stable and satisfactory working solution, but we'd never pretend it's an "answer", certainly not one that is "permanent".
Finally, I look at medication therapy as a tool to achieve a goal. Tools are wonderful and interesting artifacts in their own right, but useful only to the extent we employ them skillfully toward achieving a defined purpose.
By themselves medications will not solve the problem, there are many things the patient must practice and learn in order to get better. This is essentially what you said and I think it is spot on.