Sorry to hear that. My mom died 5 years ago. She was the only person in my life that loved me. i was very attached to her. It was the first death of a family member. It changed me completely, after that i had a feeling that death waits around every corner and that at every moment anyone can die. Its only then when you realize how we take for granted family members by thinking they will always be around. It put me into state of dread and despair. Nothing mattered anymore and everything seemed pointless. I had a feeling that my life ended and im only waiting for my death to come.
Its not easy, its very hard experience filled with regrets, grief, guilt. But it gets easier and life goes on either you like it or not. I would say after 6 months you start going back to your old self and during day you even joke and keep yourself busy. Its hard at night and you get dreams of things you try to push down. I think after 1.5~3 years you completely accept that that person is gone.
Be strong, i dont know what else to tell you. I wish you well.