It's frightening, treatment. Especially when it goes wrong. I so hope he moves on from this - I think your DH and mine had cancers in similar places and it is hard, hard, hard. We were also palliative from the outset.
My DH and I had only 7 months from diagnosis, and without the palliative chemo, we would have had far less than that. Is there someone he can talk to honestly at the hospital?
One thing I learned though is that the doctors are very quick to pull treatment if someone isn't strong enough to take it. If they're talking about continuing with it, even in a reduced form, it's worth listening!
I can really identify with the resentment about the unit though - they have such disrespect for the life of patients in the oddest way. They spend a fortune and lavish care to try and prolong life, but take over your day to day life completely. I have never felt a loss of control like it. My DH kept working throughout his treatment, and he was infuriated so many times by late appointments, time wasting and the feeling that the hospital expected him to just drop everything and dance to their tune. It is hard enough having terminal cancer, without feeling as though the life you have left belongs to the hospital.
With all my heart, I hope he moves on from wanting to stop treatment; in your shoes and mine every extra day means the world.