It comes and it goes.
It twists and it turns
Restless in its world of torment

It rears its vulgur head;
Eating its fill of splattered brain,
Gnawing its way into the fathoms of your mind.

Crunching and Grinding its way
Through unprotected skull.

Laughing, it retreats into its
  menacing slumber
Only to be summoned angrily by its
  self timing.

It's in my head right now;
Feeding on the remnants of protoplasm;
Drinking my sanity,
Squeezing my emotion,
Leaving me mindless.

A happy ending?
NO.
The migraine NEVER leaves a happy ending.