how long did yours last?Have you bumped your head?
It might be a migraine. First time I got one, I didn't have that bad of a headache, but my vision was blurry and I was in a daze. I couldn't read a paragraph and make sense of it.
Mine kinda freaked me out because I was afraid I was having a stroke, so I went to the doctor. I had an MRI just to be sure, but it was just adult onset migraine. Thankfully no more occurrences since then.