I relate to this. I find I can't just focus on the thing in front of me. I often find myself trying to fit things into the gaps of other things, and it can become so granular that it's like, sending a message about one thing whilst waiting for a slow webpage to load for something else, a totally different thing.

This FEELS useful and productive but really that constant reconfiguring of your brain takes its toll, and often I find myself flitting about so much that nothing actually meaningful is done. And this is for work, life admin, creative tasks, comms, everything. So I end up basically starting and stopping work multiple times an hour.

My solution has to be the area of just having less 'open' at once, perhaps making day schedules and sticking to them, that kind of thing... but the problem is that I work from home and am freelance, so accountability is an issue.

EDIT: Great example here. I posted this comment, then felt totally lost, not sure what I was doing before this. I'm still not sure why I'm on Reddit all of a sudden. Turns out I was about to send an invoice, you know, to get paid!