It happens all too often.
Sometimes it's sudden, sometimes it's gradual. But, before I know it, my head is pounding. I try to massage my temples, which eases the pain for a little bit, but does nothing in the long run. I take two Excedrin Migraine pills, which do help, but it always takes a little time for them to set in.
In the meantime, I try to avoid all lights and loud sounds. I crawl into my room, as dark as I can make it, and snuggle under the warm blankets.
And then - I call out for the best headache treatment I know of. "Lewis! Ebony!" In just a few seconds, I can hear a pitter-patter of little feet and the jangle of tags on a collar. A black head and a black and white head appear at the end of my bed. I pet them, rubbing their soft fur until they purr. They curl up at my feet, or on my legs, and I lay back and let their warm bodies relax me. Hopefully, I fall asleep quickly, to wake up later feeling refreshed and renewed.
That's what works for me. :-)