I don't know if it would actually be helpful to you, but I've read several books on the subject by more recent teachers. They really tend to address the kinds of things that are cognitive in nature though, or as the emotions affect us, that sort of thing.
Scizophrenia ... well, with the caveat that I've been "out of the loop" for about 18 years, which is an eternity in the field of neuroscience, but my strong impression is that brain structure and neurotransmitters play a HUGE role in that one. It's a bit of chicken-and-egg in that I have not seen it conclusively demonstrated that the physical components necessarily precipitate, but for all I know they may have demonstrated that by now.
My point is, how we think, how we relate to God, and so much more has TRENENDOUS potential impact on our mental health, surely, but schizophrenia may very well be a primarily medical condition.
That doesn't mean you can't benefit by right thinking - we all can. But it might mean that wrong thinking isn't the cause of your condition.
With that said, there are crossovers between psychotherapy and Orthodoxy out there. I should have been more diligent in tracking them down - result being I know of a few, but I'm not sure they would be helpful to you. Is that the kind of info you are looking for?