That is one awful worrying post :(
The thing is no medic here can help as he needs to be actually treated.
All I would suggest is that she tells him point blank that she has phoned and ambulance and be harsh (to be kind) by saying she doesnt want his death on her concience. Lie and say that they have promised to treat him at home to start with. That at least would get them in the door to see what state he was in.
Then I am afraid it will be up to ambulance men to convince him to go to hospital. At least she would know she has done the right thing.
I think tho if he can still be that stubborn in that much pain that he knows it is bad and doesnt need telling so. And he knows he wont come out of hospital.
:(