First off, I want to assure you that you are neither guilty nor responsible for the actions of your brother and consequences thereof. You can't take responsibility for an adult person's actions. Caring for someone and taking responsibility are two different things.
I once was in a relationship with a girl who strangely happened to always need my help after we broke up. There were heroin/morphine and cocaine involved. I know how it all works too well as I went through opioid addiction and did many stupid things along the way too. She would call me from somebody's flat at night telling me she either overdosed or that she thinks she's about to overdose. And she did multiple times. I can still remember driving like nuts to a hospital through the centre of one big city, because I had her on the back-seat spaced out and I knew she could die any minute... That was a few years ago. A few weeks ago she got beaten by her guy who happens to be a policeman and provided her either with drugs or money for. She called up her friend to come and eventually after all these years she got to detox for the first time in her life of her own free will (earlier she ran from two rehab centres). The case has come up in a court, because she was hospitalised for more than 7 days and finally she's about to get on the maintenance program.
Now, there was absolutely nothing, and I mean it, that would have stopped her before. She did what she wanted and she wouldn't listen. Back then I was addicted to morphine/opioids i.v. myself and when I detoxified myself, I offered her that I could help her get that monkey off her back, but she never wanted to. When we were still together, at one time we both switched to methadone to gradually taper down. When she was feeling bad, the first thing she did was taking a bus to get the city 170km away to get heroin, instead of talking to me. I was there for her and wanted both of us to get out of that hell. No way! She didn't even see when her later boyfriend sold morphine to her younger sister, she was so high (or rather low...) all the time. I talked to the guy myself, because otherwise he would make a 16-year old an addict to one of the worst drugs to come off.
I am sure that you've been through terrible moments because of your brother and his actions, and I'm sure that you've been trying to help him and I bet he rejects any kind of help. He may do it all, he's an adult person, right? Is his schizophrenia so serious that he can't think clearly and doesn't know what he does? I doubt that after reading your post. You've got your own life and don't let it slip by devoting yourself to a person who doesn't want it or doesn't care. You need to set the limits for your own good and your family's. Otherwise you'll be not only hurting yourself, but also you'll be harming other people close to you. You can't force your brother to slow down, you can't make him seek professional help. Right now it's you who needs help to sort it all out, so you don't suffer. You see, back then when I was deeply addicted and aside from shooting up I would pop any amount of chill pills I would have, and although I had glimmers of conscience, most of the time I thought I was perfectly fine with what I did and assured myself this was the only way for me to live, because with no chemical aid to space myself out all my problems would weigh me down and I felt that nobody understood me. It took years before I myself decided to get off.
I would advise you to seek some therapy for yourself. You don't have to go hardcore, you may look for some group therapy with meetings once a week, so you can share all your negative feelings and emotions with other people who go through similar problems. For a short period of time I went to such meetings and there were more people like you who had problems with their brothers, sisters, sons, daughters, husbands, and wives than people with the original problem hurting their close ones. Places offering such therapies usually have people who can serve you also with legal advice and tell you what your options are to further help your brother depending on the situation. You need to figure out how to bring some peace to this chaos you're currently living in. And that's definitely a way to go. If your brother sees his mistakes and reasons why he's failing in life right now, then it'll be of benefit to him too as there'll be a place for him to turn for professional help.
You described the situation generally, but I suppose there are some stimulants and probably other drugs involved. Until he stops using, it'll be very hard to convince him he's doing harm both to himself and to other people. At the moment you are manipulated by him who most probably isn't 100% aware of what he's been doing and how it will end if he doesn't change.
Wish you all the best! Be strong and most importantly do not blame yourself, because you're making yourself codependent that way.