I've been 60 minutes of focused work away from wrapping up this current ticket for the past two days. Too exhausted to get going in the morning before meetings and interruptions kill my productivity for the day. Usually I start work two hours before the workday actually starts because context switching and meetings drain me, and deep work won't get done otherwise. The curse of ADHD.
I already know I don't have ADHD, so I can tell you it might not be your ADHD. It's not that you're ruminating about what they asked, but that they all keep asking you because they use you as their syncing mechanism and must repeat yourself to several people. Effectively just as bad for productivity.
Morning meetings are a deliberate tactic. Middle management needs answers for their next meeting which is also right after yours in the morning.
The people who get to have meetings at the very end of the day are at the top of the hierarchy, and guess what? They got their work done!
If there was ever a real example of inequality that should be fixed (fuck all that DEI shit) this would be it. Work from home actually massively reduced this meeting train crap at my workplace, but they just found other ways to annoy people. It's still an improvement though.