I called my doctor's office to schedule an appointment and when the receptionist asked what the appointment was for, I simply said "brain fog". I had no other way to describe it.
It was intense and disturbing. I often couldn't put cohererent thoughts together, I was constantly forgetting what I was doing, forgetting where I had just put something.
Over the coming weeks it slowly receded, but there's no doubt it is real.
I've had people dismiss it as "it's all in your mind". They're right on some level ... it was in my mind. But it was very real, and I have no doubt it was SARS-CoV-2 related due to the timing and sheer intensity of it.