I saw online a few years ago a headache described not as an event but rather as a symbiotic parasite that lives inside the skull. More often than not it lets the host live in peace, but sometimes it moves around, and pain in the result. Occasionally, a lot of pain is the result.
This is one of those occasions.
This is just a monster.
It seems to be everywhere.
I just want to stab myself in the head. Give the body a different locus of pain to focus upon.