Very strange “metal” experience.

Today something very odd happened to me. I am wondering if any of you have ever experienced anything like this and what you made of it.

I was typing descriptions for one of my shops when suddenly I experienced a form of what I can only describe as word blindness. I could see the words and the letters but they meant nothing to me. I knew what the words were for. However when I tried to compose a sentence I couldn’t do it competently. I was getting the words in the wrong order and mis-spelling them. I have never suffered from dyslexia but I can imagine that trying to make sense of words may be something like this.

I left the computer, relaxed and had a coffee for a few minutes. When I returned to the task the effect had disappeared and I was able to function normally again. However Ive noticed that for some years now I often transpose letters when I type quite ordinary words and have to go back and correct them.

Some years ago I had a colonscopy and took advantage of the anaesthetic offered. When I returned home I dismissed my nephew who had offered to stay with me until bedtime. Shortly after he went I experienced the same effect. I assumed it was some residual effect from the anaesthetic and went to be. When I woke I was fine and have never experienced it since until today.

I did try googling but it only mentions anomic aphasia. In the latter people can still speak and write fluently but the words may lack real substance or sense. This is apparently a progressive neurological condition.