I was referred to a psychiatrist who had me fill out a questionnaire, and we spent about an hour iterating through my life beginning from childhood. The questions they asked, individually, felt meaningless, but trends emerged fast.

I get that these questions can be gamed if you're just seeking a prescription, but in my case I'm generally quite hesitant to take these sorts of drugs. I have close friends who had many very messed up years due to struggles with ADHD medication.

Now I feel like I'm living life with my eyes open. Far from perfect, but I am able to have ownership of my issues.

Meds aside (which do help, and not all will trigger personality or physical changes), there are some coping mechanisms which you can pick up. Even with meds, you’re really only given a bit more control over your attention, so having coping mechanisms are still useful.