First just let me say that you have my sympathies.I know exactly what you are going through.You just explained my son to a tee.completely.My son was Dxed with a bi polar disorder back in March of this past year.I have to ask you, is your brother on ANY type of anti depressant?This is what actually caused my son to develop Bi polar III.It is a type of bi polar that is caused by the use of SSRIs(anti Ds)we have absolutely no family Hx of any type of mental health disorder on either side of the family.And this is going back through many generations.This was totally and completely generated by the use of the SSRIs he tried.

Now, if he is not on any type of meds, this is still probably some type of bi polar disorder as his behavior is right on the money for it just by what you have stated in your post.He needs to be placed into a good mental health facility for an evaluation asap.You will get this done much more easily if he is in crisis(having one of those episodes that you have to call the police for?)when my son had the last over the top anger explosion,i called the police and they were really great and I asked to have him placed in a facility that I knew could help him.By the second day, his psyhc doc knew exactly what was wrong with him.But they still did all the other testing and even did an MRI on his brain to make sure that they had given him the right Dx.My son was taken off of those hidious SSRIs and placed on depakote and the change in him is truely amazing.He has had no explosions since then and is back to the normal happy funloving caring boy I had before.The transformation was really quite profound.You really really do need to get him into the proper facility for him to have a very in depth eval.I can almost guarentee you he has some sort of bi polar condition.Look up and do some research on bi polar and its symptoms,and i think you will agree.I hope you can get him the help he so desperately needs.He is very lucky to have such a caring brother.Please get him placed in the proper mental health facility soon,for his sake as well as yours and your mothers.I know this is really tearing your mom up inside and you too.It was just horrible to watch my sons wonderful personality just deteriorate into someone that I just did not know anymore.I was actually afraid of my own child.But I am very thankful to the people at the hospital who really wanted to help him,they really were a godsend to us.I was just about at the end of my rope there.Good luck and please keep me posted,K?Marcia