You sound exactly like me just after I got my diagnosis at the end of 2022. I have combined ADHD - so both ADHD (hyperactive) and ADHD (inattentive)
Just having a diagnosis helped, and though I was still a little convinced that I'd just tricked the psych it also helped me reframe some big moments in my life that I thought we just my crapness.
The meds are interesting, the 1st time I took a stimulant I just could not keep my eyes open!