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.