What is the best remedy for the ill effects of a very bad hangover?

My friend (who is here) is nauseasous from his hangover and has a bad headache. What are some good home remedies? I think it’s bad because during the course of the night he drank a good amount of three different hard liquors, Grey Goose, Hennesy and Rum. Would this make it particularly bad?
I suppose I feel flattered by the couple of the attempts to try and analyze drinking in general or why he consumed a lot of alcohol. It is irrelevant. But if you must know, we were celebrating and this person is not an alcoholic. There is no underlying problem and it was not done as way of alleviating depression.

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