My ADHD isn't going to let me read all 20 pages of this (lol), but I wanted to mention How To ADHD in case nobody has yet. It's a youtube channel, and she also has a Patreon, along with a Discord that has a supportive community of people who have not only ADD/ADHD, but often all sorts of comorbid combinations of things (depression, anxiety, sleep disorders, and so on). There are a lot of resources there and a lot of support. I can't pay attention to that throughout the day either, but it's nice to have.
I'm all for people trying for testing. I just wanted to mention that there is sometimes a possible downside to taking the tests. Outside of observing your actual brain activity, the currently available tests are a pretty poor measurement of need for some people, and taking a test and being told you do not have ADHD can actually make it more difficult to get a reassessment and diagnosis. I would very probably not show up as ADHD with most tests available, but adding concerta to my meds has made a phenomenal difference in my life.
It's pretty easy to tell whether or not you need the medications, anyway. If you don't, you will know right away, because you'll probably feel like you're about to blast off into low orbit, instead of suddenly able to focus. Some doctors can be reluctant to try them without testing, but often, at low doses, they aren't. It can be worth asking, depending on how you feel about medications in general, your current needs/stability, etc.