I get migraines but they're all different. Sometimes I get the halo and no headache but I basically collapse from exhaustion. Sometimes I get the headache and halo and sometimes just the headache.
And I was surprised by the halo when I first started getting them. Having no experience, I thought the halo would be like light in my peripheral vision or something like that. But for me, it's like a jagged rip in my vision where part of the world disappears into a kaleidoscope within that jagged tear. Like looking through a lightning bolt shaped rip into another plane in the middle of my vision but I can see everything else normally. Initially, I was convinced it was a detached retina or something but after a bit of googling I found out it's a known type of migraine halo sometimes called an optical migraine.