What a dilemma Lucky. I really feel for you.
I can imagine it is quite easy for any person caring long term for a loved one to become both exhausted, physically and mentally - and then resentful. It's no life, is it, even though you continue to do your best for your OH.
And there must be an awful lot of guilt too, because you know your dear OH wants to be at home.
I really feel for you. I cared for my old Mum for many years and I know it took its toll, even though I loved her dearly. Please do try to escape the home front if and when you can. You have received so much good advice here and I cannot really add to it other than to say look after yourself and rest when time allows. 