I really need some support?

I've been living with a sibling that has uncontrollable mood swings. They suffer from mulitple personality disorder and a voracious appetite. This is a male individual and it's been obnoxious for years. This has taunted my family for many years. The gluttony of this person is overwhelming, they have a maniacal spirit that can't be shaken. Every time I walk into the room with this individual, I always feel a bad vibe. Will there be a resolution to this persons vindictive hateful ways? My whole entire family is suffering from this utter foolishness. We don't have money for a counselor. Oh! they abruptly make arguments out of thin air. When you really react to it, they pause and ysis your facial reaction and become calm. While you are still boiling steam inside. Then they laugh and say why are you so worked up. For the life of me, we just can't get along and I'm sick of it. Because of the economy there is no financial way of moving. They are rude to my mother and my sister. We totally clash and I'm wondering were we enemies in another life time? What caused God for us to become a unit as a family? Am I suppose to resolve something with this guy, because I don't no reason of that ever happening. A really bad aura. Please I need some advice.