visual migraine that doesn't go away

[boxofdelights]

Last night, while she was waiting to catch the train back to Portland, Nixie texted me about experiencing bright-light afterimages that weren't going away. I said it sounds like a visual migraine, I used to get those, I'm glad you're not driving, it'll probably be gone by morning.

This morning they were still there. Eventually she went to the emergency room, where, eventually, they decided she needed a CAT scan. The CAT scan was fine so now they want to do an MRI.

How scared should I be?