I believe that visual anomalies like these usually precede a headache. I always thought the pain was vascular in origin when the blood vessels constrict but since the brain has no pain receptors where does the pain come from? How can blood vessels have their own nerves? Perhaps the brain does feel pain when it is oxygen restricted. The pain is associated with the eyes from the eyes to the occipital and neck region.

Obviously something is disrupting/blocking visual impulses. Drugs that open neural pathways seem to restore normal function but often by too much like LSD. Detectives of migraine phenomena often point to biochemical causes with a trigger mechanism. What if it is merely a short circuit that migrates like epilepsy but with no convulsions?

By comparing experiences the cumulative similarities will advance our own musings. Sometimes we are our own best doctors.