More of a WWYD I suppose. Tonight is DH's work do. It's a large, multi-national company and it's always quite a grand affair, somewhere very posh, everyone dresses up, three course sit down meal, dancing etc. They put everyone up in a hotel in a central location as there's lots of different teams scattered around the country so after the main event ends everyone meets back at the hotel bar and it tends to go on til the early hours. You get the idea. It's quite formal, DH likes some of his colleagues but none of them really socialise together and certainly aren't mates so everyone is always on their best behavior.
Anyway, we live three hours from the city where the party is taking place so thought we might as well get here early and make a day of it. Unfortunately, after lunch I suddenly started throwing up. I was having to run in and out of pubs, coffee shops etc so we went back to the hotel. Then I started with the other end 
Since then I've been stuck in the hotel bathroom. I feel like death.
We're due to meet everyone to head to the venue in a couple of hours. DH has said don't worry if you're not up to going but he hates these formal events so I know he'll hate going alone although he'd never put pressure on me. Mostly, im really worried that if I don't go his bosses will think I've basically come along for a free night in the hotel and to take advantage of the facilities. Obviously, that's not the case. I'd much rather be at home but I can't very well hop on a train in this state.
I just can't stand the thought of getting dolled up and spending all night making polite small talk with people I hardly know in between running back and forth to the bathroom, let alone having to sit down to a big meal. But I don't want to embarrass DH or make things difficult with his work colleagues.
What would you do?