Worried about dad

Hi, my dad has advanced prostate cancer, and was told a week ago there is no more that can be done, and was given six months, which has totally sent him and our family into complete shock,  he has exhausted all easy options as we were told, as has been on abiraterone and they said as his psa is going up and doubling time of every 4 weeks it doesn’t seem viable now, he could have chemo but this would put too much strain on his body and we were told it would only give him a couple of months extra at the most, he has zoladex and on dexamethasone which he is to continue, dad decided against it as doesn’t want to put himself through such gruelling treatment, he has already had radiotherapy a few years ago so that wasn’t an option either.

I guess I’m reaching out as I’m at a loss what to do next?  putting a time on someone’s life is awful, my mum died suddenly 7 years ago, which was awful in every way possible, but this has really hit hard especially with my dad.

Any help would be greatly appreciated.