First off, I want to wish you and your mother safety and freedom. What you described sounds like a very difficult situation, and I hope it works out well for you.
"It has gotten to the point where I seriously refer him to being an emotional abuser. A bully."
I think you need to trust what you feel on this. I can't imagine that it is easy to. I am sure that you are right about this. It may not be his intent, it may not be something he has full control of, but the effect he has on you is VERY real, and needs to be resolved.
Many things from your post are similar to the situation I'm in now. I am in the process of removing myself from my family. I am older (36), but have been living with my parents, who are dysfunctional in any ways. The hostile environment, and constant manipulation from my mother are very unhealthy for me. For the last year or more, I have been living in fear. My mother is in early stages of dementia, and her mood is unstable. Any interaction with her has the potential to result in her lashing out. It is not a safe or healthy place for me to be, so I am leaving in a couple weeks.
With my mother, I know that part of the problem is her dementia, which is probably beyond her control, or anyone's. That doesn't change the situation, though. An unhealthy environment for me will still be an unhealthy environment for me, even if it is not her fault or under her control. I think the same may be true with your father.
When you describe your situation, it sounds like you live in fear in a similar way. When you ask about whether it will get better, I think you need to really think about what it would take for you to not live in fear. If he didn't do anything troubling for a week? for a month? for a year? for 5 years? However long it would take, would you be living in fear during that time? Would you trust him? You don't need to give me any answers to these questions, but please think about them. No one deserves to live in fear.
I hope that you and your mother find a safe and healthy situation. You deserve that.