I used to get super-duper, rip-roarin' hangovers after a good night of drinkin'. In addition to the basics (asprin, water, etc..) I found that the best thing to make me feel better was greasy food. There was a cheap-ass drive through place called Hot & Now that I would hit and grab a burger, fries and a big-ass Coke. That almost always did the trick.
As far as losing the car, I've done that, too. In college I lived in an apartment complex with a very big parking area, and had to walk around the place several times on morning afters to find where I put it.