My head aches so.
Hidoku atama ga itamu.
cruel; heartless; hard; harsh; severe; violent; intense; strong; heavy; extreme; very bad; terrible; awful; excessive; exorbitant; unreasonable; outrageous; unfair; unjust
head; hair (on one's head); mind; brains; intellect; leader; chief; boss; captain; top; tip; beginning; start; head; person; top structural component of a kanji
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
to hurt; to feel a pain; to be injured; to be spoiled (e.g. food)