My personal condolances. It will take time to get over such a loss. I'm not over the loss of my father. Just by typing this i'm almost breaking into tears. I cannot belive that my father is gone either - it seems so surreal that i will never meet him again, but i have almost accepted it now. Death is unfortunately a part of life.
I've learned that the best thing to do is to keep yourself occupied, and i did so by learning as much as possible about his life and documenting it to celebrate who he were, saving family pictures, super8 movies and other material that noone seemed to care about. But that is what i did, it may - or may not work for you.
Now, 6 months after the event i feel alot better, the first week was hell. A college of mine said that it may take up to 1 to 2 years before you get back to normal. Do not forget to take care of yourself: helping others is nice, but you risk draining yourself if you are not looking out for yourself.