I'm sorry to read about your plight. I get the occasional aura but they are nothing like what you describe.
How long does the aura persist once the headache has set in ? My doc is always concerned and stresses I need to be concerned if the auras persist beyond 20 minutes after the onset of the migraine.
Also, a migraine has a prodrome that can start 24 hours before the onset of migraine. I have yet to hear of a prodrome with the same visual symptoms as an aura. What does your md say about this presentation of auras ?
I can tell a migraine is coming, probably the next, when I invert words or syllables.
A few hours before a migraine, I also notice water retention, inducing urgent need to pee when the migraine is relieved.
Hope my experience is helpful by showing some different presentation.
Best of luck.