My deepest sympathies to you, Pixie.

What you're going through right now is the hardest part, knowing the end is nigh. I've been there and it sucks.

Talk with him about everything you can think of - I'd give a great deal to talk with my Dad again for just an hour, to bounce different things off him and get his input... and just shoot the breeze about unimportant things, too. Especially his stories about you and your family, and write them down for yourself because your memory does strange things during times of grief and you might forget some details. To me, his recollections and stories were the most important memories that helped me.

Keep your chin up and remember that many of us have gone through your situation. You're not alone.