Kǎojuàn shàng de tímù tài nán, ràng tā kàn le dōu fāyūn.
The questions on the exam were so hard that just looking at them made her head spin.
Tips
usage
发晕 can be used both physically (actual dizziness) and figuratively (being overwhelmed or confused by something complex). The figurative use is colloquial.