冗談はともかく、君の頭脳は医者にみせるべきだ。

English Translation

Joking apart, you ought to see a doctor about your headache.

I don’t see “headache” here: I think this means "you should have your head/brain seen by a doctor.

@mike-lima
The Japanese sentence, particularly the 頭脳 (ずのう) part, sounds unnatural. It means that “your brain should be examined by a doctor” (because you are talking crap and I’m seriously afraid you might have a head injury or dementia.)
“Headache” should be 頭痛 (ずつう).

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