From what you stated,you said/did something that made your brother think you went crazy,most likely from the booze,so now you have a big problem that is going to cost you $$$$$$. If it's the booze,stop frikin drinking as you cannot control your emotions,as to the gun,clean the thing at your home and don't drink while cleaning it.
People here say it's legal to be armed and drink,all good and well,but in this case,guns and booze did not mix.
Man,you must have said/done some scary chit to have your brother do what he did.