Justin,
Please know that I am thinking of you, probably from across the map!!!
I lost my Dad to a rare asbestos cancer 6 years ago. Indeed, it was the saddest day of my life. Dad's are special people, especially to sons. Please know that the sadness does leave you and it is replaced with all the good memories you shared together. I look back now, 6 years later and still VERY MUCH miss him and wish he was here, but I will ALWAYS have the memories that I cherish.
I found out that it helped me to keep a journal of my feelings and writing down the the good memories, funny stories, or silly things we did together. Now when I read them, I laugh and laugh and I don't have to worry about ever forgetting!!!
I can't promise it will not feel worse in the near future, but I can PROMISE that there is a light at the the end of the tunnel and will get better!!
Debi