I have fibromyalgia and often deal with brain fog. I don't mind so much when I am aware of it and need to ask for help. What bothers me the most is when I am in brain fog and not aware of it, so I do the math (wrong) and it seems right, so I cut and then oops, it's wrong. Grrr... I have even gone over the math several times, and still had it seem right but be wrong!