This happens to me, too, when I'm going through a lot emotionally. Except, I'll be reading a book and none of the words will make sense. I know EVERYONE sometimes reads a sentence or two and wasn't paying attention enough to understand. But I mean, like, even if I'm completely focused on my book, I can't understand what is happening. Even if I read it out loud.
This doesn't happen when I talk to counselors. But I do kind of block out my counselor when he won't let me speak but keeps talking about himself.
__________________
"You drown not by falling into a river, but by staying submerged in it."
- Paulo Coelho