Root of my depression

I realize why I was depressed for some years. My grandfather passed away on September 24, 2007. I missed him a lot. All of my depression that I had was about him and how I will live my life without him. I was worried that we will not make it without him but I see that my familiy is doing fine without him. Even thought he was an alcoholic, I really miss him. I hope I can heal from this soon. I know it might take some years to heal but I hope I can accept his death. One day at a time.