The best replacement for hangover is alcohol poisoning.

The best alternatives to hangover are rated as following:
★★★★★  alcohol poisoning
★★★  food poisoning
★★★  hungover
★★  concussion
★★  withdrawal
★★  morning sickness
★  stomach bug
★  hangover
★  migraine
★  stomach flu
★  bridesmaids
  alcohol withdrawal
  beer hangover
  due date
  alcohol withdrawal symptoms

Your alternative for hangover is not listed? Suggest!
Speaking about hangover, one probably shouldn't forget about anxiety.

Other search terms related to hangover and their ratings are:

★★★★★ anxiety
★★★★★ drinking
★★ alcohol
★★ drinking alcohol
★★ heart palpitations
★★ getting drunk
★★ vodka
You have in mind a companion for hangover and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of hangover in all years. Click on graph for more.
alcohol poisoning
food poisoning