This is how my brother is right now. He says he needs to be alone because of his anger. I don't know there is anything I can do, or what he is doing to make it better, it seems to get worse the longer he is alone and fueling it by researching about conspiracies, and forming ever darker theories. I almost got him to laugh yesterday, but not quite.
I get very very angry at times. Not like I want to kill, but like I want to turn everything upside down.
I pray, and write. I have started writing with both hands since I listened to John Bradshaw's Homecoming. It helped with my anger (which was bottled for years and years).
Hypno was the first thing that really helped (I was really too scared to face my own anger before I had hypnotherapy).
I don't know how you'll do it, but I hope you can find a safe way of unbottling it