How long are you away for?
Def book yourself another room. Its somewhere to go to make private calls and use the Internet.
Change your flight. Earlier is better, and ask the airline if you can either upgrade.
He's trying to control the narrative. He is not your friend and don't imagine for a moment he isn't getting support from her. Ignore her, how he feels etc, concentrate on you.
Contact your family, tell them, arrange for transport for you when you land.
If you have a joint account, pop online and move 50% to your personal account.
Presumably you don't want to stay with him? If you are totally confused, you don't have to answer him or anyone else right now. Just say ' I don't want to talk about it today'
Ref home, he isn't going to move out, is he? Get the place valued, he can buy you out or put it on the market.
Strongly advise for your own mental health you move out. Does your job offer counselling? Call and book immediately. Someone to rant at.
Also of course, contact a solicitor now, have a video call and get the show on the road.
Can you fly a friend out, or your mum?