Quick update...
Today I go in for an eye exam. I've used an extremely scientific and exacting process known as "a gut feeling" to conclude that the cause of all my headaches and dizziness of the past few weeks has been the result of a changing perscription. Even if it hasn't, though, these lenses of mine are getting so scratched-up that new glasses are probably necessary regardless. (The ones I have are close to five years old and haven't exactly been babied, let's just say.) So it's off to LensCrafters, which has always done right by me. I'm hoping all goes well from a money aspect too...