The best replacement for faint is feint.

The best alternatives to faint are rated as following:
★★★★★  feint
★★★★  seizure
★★★  pass out
★★  toxic
★★  blackout
★★  feint of heart
★★  dizzy
★  collapse
★  light headed
★  dizziness
★  grow weary
  have a seizure
  syncope
  jigga what

Your alternative for faint is not listed? Suggest!
Speaking about faint, one probably shouldn't forget about bright eyes.

Other search terms related to faint and their ratings are:
★★★★★ bright eyes
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Google Trends

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faint
feint
seizure