My dad (M62) diagnosed with prostate cancer in bone

We have just found out today that my dad has essentially incurable prostate cancer present in the bone. He is waiting for the testosterone suppression injection in two weeks time. Does anyone have any advice for the in between period of having this stage of cancer confirmed to treatment?

I am devastated and utterly lost and the world feels horrifically unfair at the moment. I love my dad dearly. The thought of him being sick and dying makes me crumble. I am doing a postgraduate at university at the moment and every moment I spend away from him makes me feel like a bad daughter. 

thank you.