Stay hydrated. I drink either tomato or orange juice, along with aspirin.
I usually chug a big bottle of water or gatorade before I go to bed and take an advil. Most of the time I still feel kind of shitty in the morning, but thats because I can't sleep well after I get drunk.
.... Keep drinking!!!
Give yourself an IV! It's the best way to hydrate yourself.
then i wake up at like 8am, take a nice dump, which usually are the standard ultra-smelly "after morning beer-poo's",