"Labeling Theory posits that self-identity and the behavior of individuals may be determined or influenced by the terms used to describe or classify them."
This means that, if you permit anyone—even a medical 'expert'—to label you as having a mental illness, you will unconsciously develop the symptoms of said mental illness.
This, then, gives way to unnecessarily being diagnosed and prescribed drugs that were never needed, and may likely be harmful to your mental and physical well-being.
You then return for more help, which means more diagnosis/labelling = more drugs = more complications = lifelong patient = $$$$$