I’m pretty sure I also have CFS. I can’t remember a time when I wasn’t exhausted. Even before I had kids! No matter how much sleep I get, it’s never enough. I did read somewhere that there are now tests for it, but I’m not sure they are in the USA yet.

Anyway, you mention multitasking and switching your focus from one thing to another, and it reminded me of this awesome Ted Talks that made a lot of sense!

You may enjoy it.