I’m so sorry for your loss. I’ve just recently lost my mother who I confided with all the time about absolutely anything and everything. It had been a little more than 100 days now and I still find myself looking for her in the deepest recess of my mind whenever I have something interesting in my life, things I would love to tell her. I guess to answer your question, yes, we can converse with our ghosts inside our heads. We would know them so well that we know how they would react.
Thank you for sharing your story and stay strong.