Looks like you had a great time. Try to clean the the bed with soap and water but if it doesn't work just say you ate something bad or blame one of your friends.
The only way to get rid of the hangover is time but remember next time to not fall asleep right away when you get home but to eat something and drink a few glasses of water. Works wonders as long as you didn't do something stupid like drinking bear, red wine and gin the same evening.