Thanks!
Guess I could have poked around the USPS website until I figgered it out. Lazy me...
Nice thing is that I don't get quite as bad of a headache, I don't think. Just the light sensitivity and the flashing lights and mild pain. Downside is that the whole world keeps spinning. Every time my chair at work spun a little today and yesterday - and on a few occasions in the past - it seemed wayyyy magnified. Not to the point where I'm falling over or throwing up or anything, but it's unnerving. At least there's a name for it. Yay.