Hi Ali

I feel your pain. We were told my Dad has Stomach, Pancreas and Liver cancer and is terminal too. I asked the 'how long' question and was told "months, certainly not years" however we are now 10 days from that and he's getting weaker by the day. 
Its horrible seeing him go through it, I'm the only child he has and he's divorced from my Mum. He has a partner but she's more of a hinderence than a help. 
I've managed to be with him all day today on our own, just me and him. I listened to all his old stories I've heard a million times before and hung on every word. i've come home and written them down so I dont forget them. 
You will have 'moments' where you collapse in grief, I know I do. I cry and sob uncontrollably, but it helps me recharge and deal with the next few days. Its always the silly stuff that sets me off too. I said something yesterday about not having to tax his car and I was gone. 
Cherish the time you have with him, its all we can do really.
Best wishes

Lisa

xx