Lulu
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
“Schizophrenia is a brain disease”...
Jusei is not a doctor, so I honestly don't know anything specialized, and I can't say anything too irresponsible, but I'd like to discuss how searching for the cause is rather than leading to a “spiritual disorder.”
In Buddhism, I will explain that every thing and thing always has a causal relationship (cause and condition) to lead to its result.
It's “no causal relationship, no result” (although it's a way of saying it like former Prime Minister Koizumi...).
So, of course, there must always be a cause and effect of Lulu's suffering from schizophrenia.
The problem is, I don't think it's very good to think about that cause and effect as something paranormal, mystical, or without proof or evidence.
That doctor certainly said it was a “brain disease,” but I'm guessing it's just a direct cause.
So, of course, there must be a cause and effect when it comes to why that brain problem occurred. I hope you can think about exploring it a little bit. Treatment will be difficult if there is absolutely no longer anything to be done about, for example, a genetic root problem or a brain organic problem, but if not, there is plenty of room for improvement.
Complex brain functions are unspecialized, but there is a possibility that inhibitors of some kind of neurosubstance, such as the function of cranial nerve circuits, immune function, effects related to hormones and secretion, and effects related to methylation function, have brought about symptoms called schizophrenia.
There are still many things to think about, such as the effects of food or external factors, etc., or the possibility that abnormalities in methylation pathways (regulation of gene expression, regulation of protein function, RNA metabolism, etc.) are affected by genetic mutations (snips).
I believe that if the cause is somehow understood, the possibility of improvement and cure will surely be quite high.
I would like you to do some research on things related to medical and biological functions rather than about “spiritual disorders.”
I pray for good deeds.
Kawaguchi Hidetoshi Gassho