Phillip,
I offer my condolences. I lost my Dad in October to pulmonary fibrosis. This Christmas was difficult but the one thought that brought my Mom, siblings, and me great comfort was knowing his suffering in this life was over, which you also experienced. One of the thoughts that has made Dad's passing easier has been to accept each memory not as a moment of sadness, but as a moment of joy, a moment to celebrate his life and all the joy he brought to our lives. It will be tough for awhile but it will get better with time.
Please take comfort in having a father who loved you. I will keep you and your family in my thoughts and prayers!
Mike