> you probably don't understand what it's like to live with constant brain fog, and to spend extra time understanding abstract concepts that used to be easy. It adds up and wastes your free time.

I have CFS, and the brain fog really is absolutely awful.

Just around 5 years ago, I was at the top of my game, and could accomplish in one day at work what would take a team of colleagues a week to do.

Now... gods, everything just seems to take me forever! I'll think "that'll take me an hour", and I'm still working on it days later. I keep catching myself staring at the screen like I'm in a trance, and yak shaving to avoid more complex tasks. I frequently forget what I was even doing.

It's hard to describe, but it's like my thought process has slowed to a crawl - my "inner monologue" remains normal, but everything else is just slow as hell. It's really difficult to focus on tasks. 5 years on, and I still overestimate my abilities; it just feels so alien still.

It's pretty much ruined my life, so yeah, don't underestimate brain fog.