I am a 9 years old girl and whenever he gets mad he becomes very rude and stupid. He never really hit me but calls me names and sometimes push me and make me cry. I love him but I do not think I like him anymore. I feel better when he is not around. When he is stupid and aggressive with my mom I get really upset. Sometimes we play a lot, a game that he made up when he was younguer and is a lot of fun, sometimes he also plays soccer with me. I wish he was always fine.

Sounds tough, especially having to grow up in a quickly changing atmosphere (mood wise)
When someone is dealing with this kind of thing it affects the whole family not just them. It's hard to ask someone as young as you to "remain supportive" when you probably have a lot on your mind growing up and all... But you can at least remember that your brother has his own thing to deal with so you can be that much more understanding.
Now that isn't an excuse for him though, he can't get away with hitting you or any other kind of abusive actions. If that happens or even if now when he upsets you and pushes you around you should let your mom/dad know what's going on. Your bro suffers but like I said it will affect your whole family, and your parents will need to be there and supportive of him the most. If he isn't with some kind of counseling maybe that would be a good idea for him? Maybe even family counseling could benefit you all..
I hope things work out, please tell someone if your bro ever hurts you it's very important to not write that off as his condition, it's still wrong and people need to know that!

They have pills for adhd(:
I'm on them
They actually calm you down and make everything more realistic.
I would say give that a try and see how it works if not then definitely go for family counciling(:
Hope this helps hun(:

I have a friend wich her brother have the same thing . You have to give him some space or what ever he like to do . Don't push him just sometime try to talk to him about thing he like to talk about .
Watch films that he like together .
It would take sometime and a lot of effort but it will be worth it
Trust me be that guy and where enemy now like really good friends
Hope that would help you:p