Awww..Dan
I am so very,very sorry
My thoughts are with you and your family.
If I could I would give you a big hug...
If you need to talk, I am here for you...{{HUGS}}
Dan, it's never easy to lose a relative, especially one as close to you as your grandfather seems to have been. Know that he's no longer in pain and has gone to a better place. He'll watch over you and be as proud from there as he would have been from here.
Live your life with his memory in your heart. Pass on his values to your grandchildren and he'll never truly die.