My deepest sympathies, I am so sorry for your loss. I know words don't make a difference, they don't change a damn thing, but you are in my thoughts.

I lost my daddy 3yrs ago very suddenly, laughing 1 minute, in a body bag 15 minutes later. The gaping hole in your life can never be filled by anyone else, but you do learn to adjust and live in your new reality, and in time you can miss him with more fondness than pain.

Just take it one breath at a time, there is no right or wrong way to feel.