What you've just described is spooky because I've been going through a similar phase.

I described it as being almost "brain dead."

I've never been through something like that before.
I would come to question in my studies and my brain just didn't have a thought on the answer, it didn't want to know, even though consciously I was trying.My brain had given up.

I've recently began to notice my breathing and realised that I waan't taking deep enough breaths.
Every now and then I take the time to take sex really deep breaths.I breath in, hold it for six seconds and then release for five seconds.

Since then my thinking has again improved.
Your brain relies heavily on oxygen so breathing correctly is more important than most people realise.

It's amazing how just breathing correctly has enabled me to think clearer.I honestly thought I was developing some kind of brain illness that suppressed me from clear thinking.

This may have nothing to do with photoreading but I find it curious that something that has never happened before would suddenly occur just as I'm changing my learning technique.

Maybe it's my brain adjusting.It interests me a lot.

Any thoughts.