> these videos are dumb, doesn't everyone do those things?
Have any person go through the adult/inattentive-type ADHD symptoms [1]. Everyone will see themselves nodding. It's difficult for people to understand the difference if they are not affected. There's a difference between common headaches and migraine, or between bad mood and depression. It's about the intensity and the frequency (broadly speaking). This doesn't mean that everyone who procrastinates has ADHD. It's really hard to explain the state of complete mental unability to perform a task that I don't like to do vs. "being lazy". When I first described my symptoms to my wife, she was also like "everyone has those symptoms from time to time". Only after reading a chapter from a book about adult ADHD she understood the difference. Unfortunately, the book is in German. What I can recommend is Dr Russel's ADHD presentation [2] and Roman Kogan's ADHD Wiki [3].
> What intervention(s) have you found the most helpful?
Well before learning about ADHD, I have developed many coping mechanisms. The use of todo lists, calendars and alarm clocks has probably made the biggest difference. As you have mentioned the "chase for novelty", I can only imagine how big your bookmark list has become. I've coped with this one by having a single "inbox" bookmark folder and clearing it frequently. Anything I want to keep for a longer time ends up in one of my tools (Static Marks [4] - a tool I've made for long-term bookmarks, OneNote for notes, my blog drafts for research material, Todoist for todos etc.).
However, no coping mechanisms will solve the constant inner restlessness. I've made several excuses for not getting myself an official diagnosis, but I want to do that soon™.
[1] https://en.wikipedia.org/wiki/Adult_attention_deficit_hypera...
[2] https://www.youtube.com/watch?v=BzhbAK1pdPM&list=PLzBixSjmbc...
[3] https://romankogan.net/adhd/
[4] https://darekkay.com/static-marks/