What Are Your Headache Metaphors?

“My headache feels like two people are pressing really hard on 2
different cookie cutters, fighting for the same piece of “dough” . . .” — Baldgirl With Headaches

This excellent description of headache pain got me wondering how other people think about their headaches or migraines. One of mine is a racquetball bouncing off the walls of a racquetball court. What comparisons do you use?