I’ve read the two best cures is a bacon cheeseburger and the other one is a bottle of Sprite.
One of the girls in the office asked me to give her 400 yen and she would be back with a concoction which would cure me. She left the office and showed up about 15 minutes later with a small (maybe 30-40 ml) brownish bottle of a cold brown liquid which she told me to drink.
Since I knew they weren't trying to kill me, I obeyed and gulped it down. It tasted like bilge water smelled but I was fully functional in about 15 minutes. It was one of those drinks which I'd seen sold out of kiosks in the platforms of subway stations. To this day, I have no idea what it was, but it worked wonders.