How I describe “the fog”

(Chapter 9 The Fog in my book)

I live with MCI - mild cognitive impairment. I have experienced "the fog” more times than I would have liked to.

When I used to work, during the thin fog, I could usually just get through it without anyone even knowing something was wrong, but when it is much thicker, it is much more obvious and I'm probably not functioning well at all. Sometimes the fog can make me feel like I'm on the outside looking in at my life. This is a very weird feeling! During the thick fog, I'm just trying to patiently wait for it to pass.