頭あたまを悩なやます

expression, godan verb (-su)

rack one's brains; worry over; be troubled by

Used when a problem or situation causes persistent mental distress or requires difficult thinking. Often implies the subject is struggling to find a solution.

• 新あたらしい企き画かくのアイデアが浮うかばなくて、頭あたまを悩なやましている。

  I'm racking my brains because I can't come up with an idea for the new project.

• 彼かれの無む責せき任にんな態たい度どに上じょう司しは頭あたまを悩なやました。

  His irresponsible attitude gave his boss a headache.