I sometimes get migraines and am barely functioning during those times. I can't even imagine how it would be if you had something like a never ending migraine. It would be pretty much impossible to have a normal life.
We're looking into the recently FDA-approved monoclonal antibody (CGRP target) migraine drug. It would change her life if it even cut out 10% of her headaches.
To the topic, yes, I've seen how chronic pain changes decision outcome probabilities, most often for the worse. It shortens perspective and priorities to the very near term. Pain is a useful informant. Chronic pain is a disabling phenomenon.
I hope you can find relief from your migraines. Have you tried the triptan family (Sumitriptan, Frovatriptan, etc)? These are symptomatic treatments that work well for a significant portion of migraineurs.
The only thing I've found that truly helps is lying completely flat - as soon as I stand back up, the pain worsens again and I start to feel nauseated.