I wouldn't be too quick to self-diagnose him with bipolar. That's a doctor's job.
There are all kinds of issues that can cause what you are describing, including but not limited to:
Bacterial infection which affects the brain (west nile, sepsis due to UTI etc)
a lot of physical pain (been here and been nasty because of it)
some trauma that occurred in the past that is only now coming to the surface (abuse by adults as a child etc)
anger management issues
drug abuse
a lot of stress
bipolar
PTSD
Some are life threatening if not treated. He needs to see someone and get real help, for his family's sake.
Only a trained professional can distinguish, with any certainty, what the real issue is that is affecting him. Even people with PhDs are sometimes wrong. For you and I it's like throwing a dart at a wall full of sticky-notes with diseases on them, with our eyes closed. The chances we are right are pretty remote since a lot of mental diseases have very similar symptoms.
I've been in your shoes. I thought it was drug abuse. ER doctors thought it was drug abuse. Turned out we were all wrong and drug abuse was just a comorbid issue with a much more serious psychiatric disease.
The doctors didn't figure out what it really was til she was in a controlled environment on antipsychotics for 4 weeks. When they realized it was something deeper than drug induced psychosis, it took almost 2 weeks of EEGs to figure out what the real problem was.
Bipolar I and/or manic delirium being confused with schizophrenia or even drug induced psychosis is just one example. In this case the symptoms can be identical, the only way to really know if it's manic delirium for sure is to do EEG's over a period of time.
This expense and amount of time it takes is why a lot of people with manic delirium are slapped with a schizophrenia label and sent on their way. Often this happens to people in poor social classes.
I'm not minimizing what you are experiencing, I'm sure it's bad or you wouldn't be here, but for him to get a proper diagnosis and get help he needs to be evaluated by someone trained to do this stuff.
Psychiatry is _really_ complex, misunderstood and confusing, even by psychiatrists

Even they don't always get it right the first time.