Wow. What can I say.
My father died seven years ago (of cancer, too), and due to things he left unattended it's been a hard ride for my family. But though it's hard for a time, one day you get up and it doesn't hurt anymore. You don't forget, but it sort of softens and you can think about it without feeling a hole in your chest.
So, in short, you'll get better, and we'll be here waiting. Take your time.
I don't know how many times I started to write a reply to this thread.
It always came out wrong.
So this time I'm just going to say that I appreciate all your kind words more than you can imagine.