You did the right thing, it just did not have the consequence you expected.
You are in a very difficult situation: I don't think schizophrenia is ever a condition that just "goes away": it is something that medication will have to be taken for, and will probably always be there.
Your brother is not responsible for his actions in such a state, but you cannot simply allow such a condition to go untreated. He could be a great risk to himself and to others.
(I suggest you try to get some sleep if you can, or at least try to rest)