Incest Survivors Support Group
Incest refers to any sexual activity between closely related persons that is illegal or socially taboo. Consensual adult incest is very rare. Incest between adults and prepubescent or adolescent children is a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood trauma. If you or a loved one is a survivor of incest, join the group...

I believe he did it.
I used to scream every night from childhood until 40 years old.It stopped when I was able to digest that trauma.
As my father used to come in my bedroom in the night,I had difficulty realising what was real from what was a nightmare.I also used to dissociate from the terror so it has taken me a long time to accept the validity of my flash backs.i could only perceive my father's face for a quarter of a second.
Our unconscious knows everything which happened,I have come to realise and it slowly delivers the message.For the conscious part, it seems unacceptable .But step by step it makes sense and suddenly becomes obvious.
I know you have an excellent therapist.It must contribute to you feeling safe and therefore remembering more stuff.
That wave of fb is going to pass.I always have to remind myself that I have already survived it from childhood and remind my inner parts that it's all finished as some do not know it.
I think my grandfather orally raped me too. I have not had the same dreams as you but other indications.
I wish I could say something useful and comforting. Try to be patient with yourself. Remember that no matter what your father did, he cannot define you. Your choices define you. You have chosen compassion and to heal, and that is why you are the better person.
But that was the past. He can't hurt you any more. You're safe now. You no longer need the protection of denial.
mega Hugs
Hugs