Does anyone else here experience brain fog?
What causes it? I always feel like my brain produces word salad when I go through examinations, thinking without actually thinking.
Even if I come across a simple concept that I went through a hundred times, my thought process becomes so unclear and confused that I struggle with it.

It feels like I have brick walls blocking my synapses. Similar feeling to how my brain anticipates a stutter during speech.
I don't use any psychedelics, nor do I smoke.

What's the cause, scientifically?