Feeling rough after Christmas? One food might be able to perk you back up in no time. We've all woken up one morning filled with regret and a pounding headache - as we try desperately to remember the entire night in case we said (or did) something embarrassing. Splitting head pain, sickness, dizziness and dehydration are all common side effects of a hangover, and can often ruin our well-intentioned Sunday plans. Of course, preventing these symptoms by drinking plenty of water the night before,