Hey there, with my AS i get severe migraines that sometimes last up to 4-5 days. As for the Uveitis, i was diagnosed with posterior uveitis before they had my definitive diagnosis of AS. Once diagnosed with the AS i was told the Uveitis was a clear warning sign. My most recent migraine battle lasted 4 days and i actually thought it was my uveitis acting up, rushed to the eye doc to be told it was a bad migraine. When i was diagnosed with the uveitis it was a sudden onset of it. One day it wasnt there the next day it was awful. Since i have posterior uveitis the active lesions are extremely close to my optic nerve and i have lost a decent part of my central vision to it between flares. If you think uveitis is a posibility i suggest finding yourself a retinal specialist! Keep up with eye exams and when you go to the dr get one of those magnets with the dot in the middle of the grid and check your eye sight daily!