I have days like that. I call it 'disjointed thinking' cause it works in stops and starts, with unfinished thoughts and struggle to find what I was thinking or just interrupted thoughts as if a flock of birds just went by and now my mind is with them. Your all not alone. My husband calls it the butterfly effect. When I don't finish something or start something new in the middle he says," look, there's a butterfly" (implying my attention was interrupted by a butterfly - something that happened years ago and stuck.