I know what you mean OP and I think it could be lockdown/WFH that's made it worse. Last Friday I was distracted by this because I'd planned to go to Tesco and another place after work on Friday and my mind was too much on this to concentrate on anything else. Plus it was then tipped up by someone asking if they could come round to drop something off, which meant I couldn't go out until 7 when I'd planned to go out at about 6.
^If i need to get multiple "things" done in a day, then I have to plot out my day from start to finish. School runs, meetings, which part of my work, when I'm having a cup of tea, everything. If I don't, time between the things is a complete waste. If I don't schedule tea breaks, I won't have any, because I'll be focussed on getting the plan done, and totally forget to eat or drink. I also then end up on high alert for the whole day (possibly more due to anxiety disorders than ADHD, but they tend to gang up on me!) It's exhausting.
Same here. I have to write lists in steps otherwise my mind is too much on forgetting things to get on with everything, then if something new needs doing, I have to rewrite the list if I can't fit it on the page in the right place, because if the list looks untidy, I can't follow it.
I've never been diagnosed but I have so many symptoms, that I almost certainly have ADHD or similar. But of course, I'm such a procrastinator that I'll never get round to talking to my GP about it or seeking a diagnosis.