The first thing not to do in case of a hangover is to go through the whiny sympathy seeking stage post waking up.
Everyone hates the guy who complains about things that he did to himself and absolutely noone wants to hear the words "I'll never drink again"
The very fact that you have drunk enough to still be ill in the morning, negates the possibility that you will never drink again.
As for the regrettable syptoms you may suffer, i can only advise the strongest medication, perscription or otherwise, that you have access to.
If you are already a habitual heroin addict for example, then i would imagine a quick fix would help.
If you are as dull as the rest of us however, water, paracetamol and fruit should help someway. Avoid coffe; contrary to popular belief, coffee dehydrates you and will make your hangover worse.
If you can, have a glass of water between real drinks. it racks up a few hours in bathroom travel at night but saves a few in the morning.