Mental illness. Seek help please guide!

My name is Najmin and I'm 28  and unmarried. My elder brother is suffering from mental illness since last 6 years, he always use abusive language and curse my parents. He is now 35 and till now he hasn't worked anywhere. We tried to help him alot but everytime he shouts at us about all his past mistakes and verbally abuses everyone. He sleeps everyday at midnight and wakes up at noon 12pm . He entirely spends all his time either by playing games on phone or taking nap. He doesn't even take bath for several days, doesn't make his bed in the morning, he hasn't any got any haircut since months. I guess he is suffering from Schizophrenia. He would never agree for any help also. I'm so distributed by his behaviour, I lose my apetite for days is he comes up with any issue, I have made safe space and living alone but is till get flashbacks of him shouting and verbally abusing me I'm financially taking care of my parents and managing work life. Where do I seek help please guide