For me it comes and goes and it varies in how bad it is. Other than taking my medication, getting enough rest and sleep I don't have any other tips. Maybe someone else will chime in. Hope the cob webs disappear for you soon ;-)
P.S. perhaps you could speak to your Dr about sleep medication? I believe that lack of sleep makes brain fog worse.

Check your ferritin.

I’m on sleep medication, theirs nothing you can do but get as much rest as you can, if you work, have a family, this can be very hard, I hope you have a good doctor you can talk with good luck.

I'm experiencing my first. I'm struggling to sleep as well. My speech is very slow. Does it eventually wear off?

After I mistakenly take the dogs meds instead of my own, answer my alarm clock instead of the phone and walk into the wall on the way to the bathroom I decide it's time for a nap.
Sleep helps 🙄