Name changer here. DP and I are currently on holiday and due to fly home in 9 hours. European country, standard big resort with buffet food. We’ve been here a few days and not left the resort and only eaten their food. Around 12 hours ago he started getting severe stomach cramps that deteriorated into D&V around 6 hours ago. DP went to the pool toilets and saw that 2 other guests had also been sick. I told the hotel and they said that they had a few guests being ill but one had gone to the medical centre and it was a general gastro bug not food poisoning 
I’ve tried to keep DP drinking fluids and rehydration salts but he’s been sick 4 times now and is in a huge amount of pain.
What else can I do? Is there any way we can still fly home today? We booked independetly so no rep to help.