Diagnosis in mental health is mostly interpretation, nothing more. There aren't tests to determine psychic or emotional conditions in the same way as there in physical health. See four different mental health professionals, get four different diagnoses (depending on their particular specialism/training/interest). If you are a hammer everything looks like a nail.

If you are critical of medication and are living with schizoid behaviour, you might be interested to do some research around the work of Rufus May: Rufus May – Holistic approaches to mental health