A lot of his anger could be his grief. I am also about to lose my husband, to a brain tumour.
A counsellor I saw recently pointed out to me that while myself and the rest of the family are losing one person, my husband is losing all of us - I can't imagine how painful I would find it if I was to loose a lot of people all at once.
My husband and I also have different beliefs about spirituality, and approach illness differently etc. While I initially approached his treatment with sheer optimism, I gradually accepted that this was not what he needed, and eventually let go of the outcome I wanted for him. It didn't seem to change much in terms of his anger, but I found it easier to let go. I had to accept that he had every right to approach his treatment the way he wanted to, on his terms, without me ramming my beliefs down his throat.
I found that I received great support from counsellors and social workers, and it was helpful for me to hear from them that I was doing a great job in looking after my husband. I also found it helpful to hear from the oncologists treating my husband that we had done everything we possibly could to treat his tumour (we recently found out that the treatments were not working).
I hope this helps you a bit.
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