How can I trick myself into generally being more relaxed during activities that are not work/school-related like household chores, during workout, during commuting, before going to bed etc.? I have often mild fear of forgetting whatever important thing I was thinking about before. "If I don't clean up in 2.5 seconds, I'll forget what I was about to do!"

It seems to me that I'm either underestimating my ability to recall or I'm aiming too high, i.e. I would actually forget important things.