Drink water before you go to bed.
Take paracetamol when you wake up.
If sleeping is an option, and you want to, do that.
Do something to distract yourself from the misery of your hangover.
Eat a full English breakfast.
If you can't handle that, just drink some broth.
Or try a bit of Marmite on toast.
If all else fails, just start drinking again.
Or... just don't drink that much in the first place.