I learned hangover countermeasures and don't ever have to go through that shit ever.
My best countermeasure is not to drink carbonated stuff. I kid you not, I can easily have many shots with no effect afterwards, but if take an equal amount of booze and mix it with soda, then the effects will show the same evening. For example champagne is one thing that turns my stomach inside out and wrecks my head, so I avoid it like plague.
Result: my hangover today did not include headaches at all. Just nausea and upset stomach. If I did not forget the second countermeasure which is to drink water before sleep, then I would wake up feeling fine. Either way the recovery was quick and successful, I made a dinner for breakfast and filled my stomach with plenty of food, drinking some fine coffee now and getting ready to clean the place up.
(mods ban me for a few hours so I will stop procrastinating)