You don't have to be the rock in the house. You don't, and you can't.

Do what you have to do to be comfortable. First and foremost lock up the guns so they are not accessible to him. He will have a fit, but don't give in on this.

Next. My mil was in the hospital when she suddenly went a little (a lot) off the wall. She was not herself. It turns out it was the medication she had been put on. A lot of meds will cause a change in personality, so check that out. Tell the doctor or have your mom mention it to him.

You will call an ambulance. That's all you need to know.

Right now, it's an adjustment that constantly needs, well, readjusting. It just is that way. So it's one day at a time. Wake up having zero expectations of how time in the house with your dad will go. Every day is like that. What's happening now is that you're grieving the person he was and wanting things to get back to normal. It is not like that but it IS okay to know that's what's going on with your thinking. Acceptance comes to people in their own time.

Lastly, don't neglect yourself. You are entitled to lead a normal life, even when tragedy or uncertainty is looming large. Go have fun and don't feel guilty about it. Responsibility does not include sacrificing your life for his comfort.

I am sorry about what's happening. I wish it wasn't the way it is.