My Father passed away right around the same age - like 58-ish.
It's bizarre more than anything. What I will say is I was spoiled rotten and had an amazing relationship with my father, so I had nothing left on the table. Wish he could have stuck around longer to really get to know his granddaughters. But that was more for him and them and not me. I couldn't have possibly asked more from the man than he gave me. So that gave me a lot of peace.
But it's impossible to fill that hole. You'll muscle on, you'll figure it out and in a weird way - you'll come out better on the other end. Just be with your family and support each other. Take the 'moments' when you need 'em and always remember the good memories with your mother. That's how you keep her alive. God bless.