In a decade and a half of work holiday parties, I’ve seen (and heard about) a lot. Intra-office hookups (juicy). Public vomiting (icky). Reality TV star antics (tabloidy). I don’t want to be the reason people gossip, but I did need to get The Post’s money’s worth at the open bar at our holiday party this Wednesday. That’s because I had an appointment bright and early the next morning to test out a wellness trend that’s meant to be the ultimate hangover cure — and what was the point if I wasn’t