For the hangover sufferer, the world is full of well-wishers anxious to persuade them that Jack Daniel's and milk, or some similarly unlikely combination really does the trick. I feel confident in stating that, aside from the ludicrously unhelpful suggestion to abstain, there is no cure. Eventually you will get better anyway, so why waste the little effort available to you on spurious remedies? Having that said, of course, there are certain things that help speed up the recovery process. These are pretty well-known, let's get through them quickly: sleep, water, food, more alcohol ("the hair of the dog that bit you.")
All undoubtedly useful in suppressing the symptoms of a hangover, but there's always the possibility that they may backfire in some way.