Estrangement Grief: Anyone else going through this?

I lost my mom at 10 years old and never got to grieve her since her pictures and things were instantly put away and I wasn’t allowed to talk about her.
As an adult, I have been estranged from my dad for 15 years. I miss him Terribly everyday but he refuses to let me back in his life.
My psychologist diagnosed me with complicated grief. I’ve been Doing some reading and understanding this saddness and talking about it helps. I really think speaking to some one will help.