If you can afford to write the day off, then a shot or two of Underberg bitters will help enormously. Fiercely alcoholic (86%) and herby and spicey, you feel them going down like fire but boy do they sit soothingly on a hungover stomach.
2 pints of water before bed and a couple of milk thistle tablets. Same when you get up with some carbs and 2 paracetomal. If poss, drink a couple of MacD's milkshakes before you hit the sauce, will make you less nauseous (cos the booze won't irritate your stomach quite so much).
If that doesn't work, it's a "duvet day".
Although my friend swears by 4 bottles of Cobra and a Phall, but he is less evolved than the rest of us!!!!