get a macdonalds with burger bun and fries plus a carton of pure orange juice such as tropicana. it's easier to digest than oranges in emergencies like hangovers and dehydration. take some exercise even if it's only a warm up or yoga.
BLACK COFFEE, A LOT OF REST, ORANGE JUICE, PICKLE JUICE, TOMATO JUICE, TAKE A SHOWER AND SWITCH BETWEEN HOT AND COLD WATER, and remember exercising helps cure hangovers!
This will cure you 100% Drink a michelada this is what i drink one every time if for some weird reason it don't work drink mineral water and bananas and lots and lots of water because hangover is caused by dehydration.