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My mom sometimes gets those, but as soon as she sees the blind spot, the takes Asprin which helps a lot. (Probably because it thins the blood and makes it easier for it to go back in the brain)
I don't ever feel nausea when it happens, but feel majorly disoriented. As for the gibberish, I don't speak much when I feel like this and try to relax (which really helps) so I couldn't tell you anything about that. It doesn't happen constantly and I haven't had a migraine since maybe early spring but its bound to happen again...... eventually........