i have a really bad hang over what can i do to feel functional?

Frequent water-drinking is the only thing that works for me, but even then I'm not 100% until the next day--it's better at preventing hangovers than curing them.

I'm going to a fat party this coming weekend, so I'm going to see if I can avoid a hangover this time--drinking a lot of water before bed the night of the party does seem to prevent it for me.

Hair of the dog. Drink a shot and a beer and go back to bed.