This is exactly what happens. The strange thing is I can still do math perfectly, just not read text. I have this little "proof of work" thing I do (usually to figure out how drunk I am!) where I derive Kirchhoff's laws from Faraday's law (a hold-over from my EE degree). I can do this just fine but I can't read beyond sounding out words like a 1st grader and even when I do that, I can't tell you what the sentence meant when I'm finished. Odder still, I can write text and then can't read what I just wrote!

The longest its ever lasted was about 1.5 hours. Usually about the time the freight-train of pain arrives, everything goes back to normal. Of course then I'm in no mood to read anything anyway.