头昏脑胀 (tóu hūn nǎo zhàng): To feel dizzy and with a swollen head — Meaning & Stroke Order

He had a cold and a fever, felt dizzy and foggy-headed, and had no choice but to ask for leave and rest at home.

After sitting for a long time in the stuffy, hot classroom, the students all felt dizzy and foggy-headed.