For a week or two, while walking around, I have had the feeling that I was lightheaded or unsteady on my feet. It was not like the room shifting. Today, I have had a sharp headache above one eye. While sitting at my desk, my field of vision shifted abruptly. What does that sound like? I have a previous history of migraines, venous varix on vein of Galen. My current medication includes Tylenol and Eletriptan.