Don't want my dad to die

Oh God I don't know where to start. I'm so upset and I don't feel like I want to live anymore. I'm here in a hospital in Rome with my father which is about to die. He was fit and healthy just last week, now I have been told by the docs that he has stage 4 cuncer lung, liver, bones, head, neck. I can't look at him, I can't watch him suffer. He is only 61 yrs. he is my father and my friend and my friend and my life. I'm a man of 35 and you would think that i would be ok, no this is far from the truth. It's not that I can't live on my own( I have lived in the uk without my father since I was 17) but every time I went home 2/3 per year my father was there. I can't stop myself crying, I don't know what to do!