Answer:

hangover

Answer	Crossword Clue
HANGOVER	"My head is pounding. I've never had such a terrible ..."
HANGOVER	Toot consequence
HANGOVER	Bachelor party aftermath

HANGOVER	Aftereffect.
HANGOVER	Something remaining from an earlier time.
HANGOVER	Surviving custom.
HANGOVER	Tippler's reward
HANGOVER	Jan. 1 malaise
HANGOVER	Jan. 1 problem for some
HANGOVER	Toot follower
HANGOVER	Drinker's next-day woe

HANGOVER	It can be a headache
HANGOVER	Post-bender headache