OKAY SO I can’t speak to the connection between ND and migraines or any evolutionary theory behind that but I can definitely infodump about a bunch else!

Migraines have four stages (not everyone experiences all of them but I apparently do xD), and only one is the headache

Stage 1: prodrome
This is the early warning that a painful migraine attack is coming. Things feel a bit off. You can get a depressed mood, euphoria (me), or a few other symptoms starting up to 48 hours before the headache stage

Stage 2: aura
This can happen for 5min to 1hr and can also happen at the same time as the start of stage 3.

Aura symptoms include seeing weird wavy lines (me), dots (me), having numbness and tingling similar to a stroke (possibly me a couple times)...