I usually don't touch anything important. Wow, have I had many of those days. The worst part, I usually don't realize it until I get to work. I'm not a morning person, just getting up takes most of my energy. I have had days when I get to work and I'm asked a question and cannot come up with the words to answer and then I stutter and slur words, can't add 2 and 2 and look like a complete idiot. I have learned to write everything down and repeat things that I'm asked to remember. Pen and paper have become my best friends. Brain fog and fatigue are worse than the pain for me so I have a lot of experience with this. Can't say I always handle it well. I tend to get down on myself and feel stupid . I'm learning how to laugh it off and just accept that it will happen.
Oh, my husband is getting used to finding things in odd places. I try and blame it on the kids but we all know it was me .
Try and see the humor in all of this, you get to do silly things and blame it on the fibro.
Hope you feel better soon!