Hyperion, If I read you right, you live in an abusive household and need to get out. If you are 20 something you can do it. Do you have relatives that you can trust? Could you confide in them and get some support? A place to stay? It is doubtful that your brother can have you locked up for something you've said. Why don't you start looking for that person, a relative, friend, doctor, social worker or neighbor who may be able to help you? You don't have to do everything in one day, just start the process.
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"Honey, would you buy me some boobles for my 40th b-day?" "No way, they're too expensive. Your own baubles will have to do."