Hey, I'd be interested in hearing from others about this dizziness feeling too. Last week I PhR all my semester's notes and felt incredibly nauseated afterwards - had to have a lie down. I am a new PhReader as well. So I wasn't sure if the nausea was due to
a) information overload
b) maybe I was flipping the pages too fast and got motion sick
c) maybe I was straining my eyes and was trying too hard to do it 'right'
d) maybe it was the dissolvable paracetomol (acetaminophen) that I had just taken for joint pain
Whatever it was, it ruined my study for the rest of the night. But I do try to console myself that it was just my brain reacting to the delicious amount of information it had just ingested.