Kidfears I am so sorry for your loss.
ElectricMelon and for you too. And I am sorry people are telling you how you should grieve.
IMissGrannyW I am sorry for your loss too. If your dad really was a bastard (and you are not meaning it in a jokey way) would some counselling help you move on?
Can I just say there is a national organisation called Cruse Bereavement Care they may be able to offer some help. Some churches will also offer a free counselling service. If you are not at all 'religious' and wish to use their services I am sure you would be most welcome to. You may find a secular agency or charity is great too.
Here is my experience, I hope it helps one of you somewhat.
My father died of a heart attach 12 years ago when I was pregnant with dd. I was totally shocked and not expecting it. I was so shocked I feared i would lose the baby (I did not, thankfully).
It did take a lot to accept I would not see him again. But time has lessened the pain and I have gotten over it. Some may not, but I have. Whether you get over things or not may be down to some element of your own choice (I believe this is the case for some of us) but also maybe for some it is just impossible to overcome.
I think what can be a big problem is when someone seems to go too early, like the loss of a child, a relatively young parent at the local school (which happened a few years back) or one of our parents just dying quite young. Or when there was unresolved issues, or perhaps sadness or cruelty in a relationship and the remaining person wants to ask 'why' or say 'sorry' or whatever. I like the idea up thread of writing a letter. I think that would really help.
My father had a long (74 years) and happy life and died peacefully in his armchair without suffering. The doctor said he was here one moment and gone the next. I've found comfort in all these things and they have helped me to find peace with his death.
I know many, many people around the world die before their time and I feel I should celebrate the good life my dad had, not the fact he did not have another 20 years and live into his 90s. but I know not everyone will share that view. We do prize long life but actually I chose to prize happy life, my dad died a relatively active, happy man in his own home. I think that was a valuable thing for him.
My sister and I threw ourselves into preparing for his funeral and looking after our mum. In a very strange way, preparing for the funeral, choosing hymns and flowers etc, all helped me to know it was real, but there was a frame work which had been well trodden by others. We could do things similar to others or different, but I felt we were not alone in the process. the funeral directors were so helpful and kind. They really helped us.