Having done a 10k the day after going to an away match to support my football team, I am *never* drinking a lot and running the next day again.
I knew we would all get rather sozzled, and even claimed I was only going to drink water on the the train back home. Oddly enough, that did not happen. I poured myself off the train at 11pm and went to bed.
I spent the first half of the 10k feeling rather green and wondering if I was going to puke. The last mile or two I didn't feel sick anymore, but was really worried about having a dose of runner's shits.
Thankfully, I didn't have to do a Paula Radcliffe, but the horror of how that run felt remains.