Maybe if your husband felt like he did have a choice in the matter of his treatment, it might make him more amenable to suggestions. So here are two choices:

1) If he continues to refuse any help, and just wants to die, the whole process of dying is not pretty and can drag on for a long time.

2) If he accepts help from wherever it is needed, to make him as comfortable as possible, he may have a better chance of getting through the tough part of Tx and surviving the whole experience.

If the idea of #2 seems daunting, maybe he could consider agreeing to just ONE meeting so he can be better informed re what the help consists of. Sometimes an objective outsider with experience in his/her field can get better help and communication going than a friend or family member. Sure hope something good happens soon.