migraine
"I start seeing what looks like bits of TV static in my vision that grows pre-migraine. This vision loss can get bad and makes me feel sick, but that is nothing compared to the migraine that follows. So as soon as I see one spot I'll wave my hand in front of my face, if it turns out its a blind spot as these static spots are, I take a couple of these Excedrin Migraine pills. They work on me in less than half an hour, and this usually halts then reverses the vision issue and of the migraine I only feel a slight dull pressure/pain where it would have been
. 
Unlike some... I actually see a reduction of anxiety. When taken before I go to sleep I get a much better night's sleep. It could be because caffeine has no effect on me."