I have brain fog frequently. I call if a mud head ache. I get a dull head ache that is accompanied by the feeling that my thoughts are stuck in mud. They just do not want to move. Usually, mine are the result of poor sleep or over exertion.

Sometimes, I can take a nap after breakfast and wake up with the mud gone.

Sometimes, I get the muddy thoughts without a head ache, but this is uncommon for me.

What kind of infection did you have? Was it just neurological or was it broader with high fever? I count an episode of high fever (well over 104.7 degrees) in my list of concussions. My temp was 104.7 after 45 minutes of cold towels. Before the cold towels, I was locked in convulsions and unable to communicate. It effected me as bad or worse than a severe head impact.

My best to you.