Perpetual headache is that ache of your topmost organ which spreads from left to right then back to right, no, left, back to left, in the process reddening your eyes, sometimes severely. This makes you go in re-imagination mode. In this mode, you imagine then re-imagine, then your system crashes. Not that your car; or you get loose motions, but you then tend to go to sleep. You confuse between your right or wrongs, sorry, I mean, rights and lefts. Then you start fantasizing, restart and again restart. But you never reach a culmnination. This is perpetual headache afterall.