Please help

We have custody of my teenage brother, he’s 14x and I’m 24 weeks pregnant and don’t know how to deal with the stress of his acting out, I’ve had him about 6 years with full custody but I would say within the last year it’s got extremely worse, he has been telling me he’s hearing voices in his head , and when he does something he shouldn’t , he blames it on the voices in his head , he told me voices in his are telling him he’s gay, I’ve been looking for a good therapist but he also has done stuff to us before that was bad and then tried to say the we wanted him to do the things to us, please help from a tired sister and ps. The parents can not get custody back, they are full on drug addicts.