What would it be considered if 4 days later your head was still throbbing? Maybe it was the pile of empty bottles at my feet, maybe it was the fact I woke up at 6am the next day to go trout fishing next to a giant waterfall, I'm not a doctor so I can't say for sure.
The only thing I know for sure is I'm never chugging a liter of JD, a liter of Vodka and a liter of 100 proof peppermint schnapps again. I felt fine when I woke up the next morning but after work had to go get my stomach pumped.