I am in the same boat as you. Noticed this note a year ago and have it bookmarked. I do believe it is true that recurring aura is progressive migraine disease, from my experience. 2001 I had a cerebral hemorrhage. Immediately afterwards I got the migraine issue in the hospital, but it was not addressed. Lortab and Neurontin for 6 months until the pain subsided to tolerant leveles. Got allergic to Lortab! Started getting the auras 4 years later. I get one per ten days on average. Fluorescent lights, PC screens and dehydration are the main triggers. Post hemorrhage recovery I found I had to limit my physical activities some, and even still.
About a year ago I did ER because of a terrible migraine that I telephone called 911. They asked me my name on route---I did not know my name! They found a benign arachanoid cyst on the surface of my brain. The MRI and contrast dye triggered daily auras for a week afterwards. Fioricet works very nicely to NOT get the migraine headache, but the aura still takes 30 minutes. Lately have been getting another aura within the intial aura, sometimes. Or when one aura finishes, another one starts at its conclusion even after taking the Fioricet. I find the aura fascinating to watch. It is always different, and the colors change between different bouts of it. I get the aura in one eye, the other eye gets the migraine. But it is just an illusion the aura is in the eyes, it is in the brain.
Currently ran this cyst thing through my GP/MD and another radiologist is involved. Because of the way my auras are progressing, have been given Topamax 25 mg twice daily to start, by my GP. I am afraid of this drug as to its many side effects. Another note will be addressed concerning my concerns about Topamax. But, I think it will be necessary to take it. And limit my summertime physical activities, more, due to the sweating intolerance this drug causes. I had to quit my running and mountain hiking since the brain bleed which was what defined who I was, then. The bleed should have killed me. Life since is gravy even with the neagative aspects of living my life.
I "met" Terri on the old Usenet migraine user group sometime around 2002 and later to About.com . And since, a few other headache venues she responds to. Terri does a valuable service for the migraine community.
(Hope this reply is not too wordy.)