The reason for a hangover is that the alcohol in your system acts like salt water, but rather than your whole body becoming dehydrated, it is just your brain, thus the headach. The nausea is caused by the fact that alcohol is the product of fermentation - in other words ROT - and your body is poisoned by the toxins. Most often it is an exessive consumption of alcohol and the afterafects are due to mild poisoning. It should be a warning to you that you have overindulged and if you had continued to drink you most likely would have succumbed. My biggest suggestion to you is to learn restraint, but barring this...
You need to hydrate your brain tissue. This can only be done by drinking fresh fluids such as water, juice or sports drinks. As a preventative measure you should ideally drink a large amount right before bed as mentioned in previous posts. If you were unable to do such, then first thing in the morning will do, but will be less effective as your body has been suffering for hours and you now need to recover.
"Hair of the dog that bit you" is a long held cure for a hang over, however, this is not a good idea. This would be like trying to cure cyanide poisoning by taking more cyanide. You are only compounding the problem if you use this method and if you were close to needing hospitalization for alcohol poisoning the night before, you may send you body into shock. The curative effects felt with this method are due to the pain relieving effects of the alcohol and do not address the underlying issues.
You need to give your body the nutrients it needs to combat the destruction caused by your "bender". Foods rich in electrolytes, vitamin C, and Iron will help to rebuild your defences, Yogurt will restore the "good" bacteria in your digestive tract and Breads provide a nice gentle thing for your stomach to process.
I would reccomend beginning with a large glass of water and 1 slice lightly buttered toast. Once you have finnished the toast your stomach should be settled quite nicely. Next eat a small yogurt (strawberry is great for this as it contains more vitamin C than a glass of OJ and it also has the anti-oxidents which will help). If you still have room a good spinach omlette would be ideal for the iron content, but if spinach is not your thing try having steak and eggs to provide you with protein and iron.
If you really need the pain relief to hit you quickly then I would suggest Advil Liquid gels, they are designed to help those of us who get migrains and are very fast acting. Just keep in mind that they are very strong for most people and I have seen them knock large men on their butt, so only take one.
Just be sure that you address the underlying reasons for your pain, don't just hide behind medication.
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Mishkarah
Elven Huntress on Eitrigg
"May the spirits guide your path, and bless your actions"
Mishkarah - lvl 70 NE Huntress (Gore lvl 70 Raptor)
Padmay - lvl 27 NE Druid
Phaidra - lvl 44 Draenei Huntress (Tethis level 43 Raptor)
Sharice - lvl 12 BE Huntress (Aragog lvl 11 spider)