Trying to keep it together for dad

Oh my god I don't know how much more I can take... My dad has been fighting cancer since Feb this year. As stated on other posts, it's spread all over now. It's gone from lung to brain, bones, kidneys and just yesterday they've found another brain tumor. He is currently in hospital because of double vision. Basically he's lost movement in his left eye completely, it is absolutely heartbreaking to witness. I took him out for some fresh air on my visit today and he broke down on me 3 times in absolute bits. Sobbing on my shoulder saying he doesn't want to die and he can't bare another brain opp. What on earth do I say to that, I didn't know what to say and I broke down too. It's literally been one thing after another, relentless none stop bad news. I am emotionally drained with working and trying to get by holding myself together. Even after all this trauma, he is still some what strong and able to do everything for himself but has yet been put on a ward with the elderly at end of life. This baffles me. The hospital is so slow at doing anything I'm hoping tomorrow he can rather go home with daily carers or to a hospice. He is not coping in the hospital