People have very real suffering & trauma, & sometimes they have unusual ways of viewing and describing life. But (as the United Nations has said for a long time) mental health issues are not biological diseases:

The United Nations Special Rapporteur Dr. Dainius Pūras calls for a move away from the biomedical model and “excessive use of psychotropic medicines...”

https://madinamerica.com/2017/06/united-nations-report-calls-revolution-mental-health-care/

“The urgent need for a shift in approach should prioritize policy innovation at the population level,” he writes, “targeting social determinants and abandon the predominant medical model that seeks to cure individuals by targeting ‘disorders.’”

https://madinamerica.com/2017/06/united-nations-report-calls-revolution-mental-health-care/

Puras continued:

“The focus on treating individual conditions inevitably leads to policy arrangements, systems and services that create narrow, ineffective and potentially harmful outcomes,” he writes. “It paves the way for further medicalization of global mental health, distracting policymakers from addressing the main risk and protective factors affecting mental health for everyone.”

https://madinamerica.com/2017/06/united-nations-report-calls-revolution-mental-health-care/

The Guardian:

The BPS released a statement claiming that there is no scientific validity to diagnostic labels such as schizophrenia or bipolar.

https://guardian.co.uk/science/blog/2013/may/20/mental-illnesses-depression-pms-culturally-determined

The BPS released a remarkable document entitled “Understanding Psychosis and Schizophrenia.” Its authors say that hearing voices and feeling paranoid are common experiences, and are often a reaction to trauma, abuse or deprivation: “Calling them symptoms of mental illness, psychosis or schizophrenia is only one way of thinking about them, with advantages and disadvantages.”
The report says that there is no strict dividing line between psychosis and normal experience: “Some people find it useful to think of themselves as having an illness. Others prefer to think of their problems as, for example, an aspect of their personality which sometimes gets them into trouble but which they would not want to be without.”
The report adds that antipsychotic medications are sometimes helpful, but that “there is no evidence that it corrects an underlying biological abnormality.” It then warns about the risk of taking these drugs for years.

https://nytimes.com/2015/01/18/opinion/sunday/t-m-luhrmann-redefining-mental-illness.html