MegVeg, I am so glad to see you post but sorry about your brother. Unfortunately the more we do at that age, the angrier they get. A lot of it is hormonal, add a bit of emotional and the drama hurts those that care.

he needs a release for emotions. would he consider doing some peer work, one day a week after school help at a program for kids, cleaning a park of liter.

I had family members that were in a real funk as I was too, lots of stress. We started to volunteer serving dinner to kids at a local after school program, from first to sixth grade. They love seeing us come.
It makes us feel good too.....Never thought emotionally we had the strength and I asked all of them to come with me at least once.....and they all have gone again.
You need to be needed,
Hope things work out, sending supportive thoughts and prayers,
di