Yeah. You basically take a whole lot of regret, and then add some nausea, a raging headache, and (if you're really unlucky) some serious uncontrollable vomiting.
Honestly, you've probably already gotten a bit of the feeling before since a hangover is basically the result of a night of dehydration. I'm sure we've all done that before unintentionally, getting a nasty headache and really bitter from lack of food/water. Just take that feeling and multiply it by 100. Oh and you can't forget to add the regret because it's an important part of a hangover.