I feel heavy in the head.
Atama ga omoi.
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
heavy; weighty; massive; heavy (feeling); depressed; gloomy; blue; uneasy; slow; sluggish; lumbering; ponderous; clumsy; important; serious; grave; serious; severe; critical; solid; established; dignified; sensible