TL;DR my dad bites himself, shakes and makes humming and hissing noises when he is mad. Seeking advice for how to handle this.

Throwaway account because I’m looking for advice for a unique situation... This has something my dad has always done when he is mad (and he is always mad) and it has gotten progressively worse over the years, to the point where it is unbearable now. When he is mad he bites his fingers and will shake and hum. He has recently started making a hissing noise instead of humming when he is biting his fingers. He does this constantly. His fingers are now destroyed and swollen with bite marks. Another thing he does is he will open his mouth wide and shake his entire body, especially his hands. He also likes to shake his entire body and tap something hard in a very aggressive manner. Currently in an unfortunate situation where I’ve had to move back home after moving far away to escape this. Listening and seeing this for hours everyday has been taking a toll on my mental health for 5 months now. I have no escape and I’m stuck.

Does anyone have any advice on how to handle this? I’m thinking it might have something to do with a mental illness but I’m not sure. He is aggressive and gets angry whenever I confront him about it. Please help.