Physicians diagnose illness as either physical or mental.
They do not diagnose emotional unwellness.
Emotional illness is seen as an oxymoron.
Illness that is neither physical nor mental is seen as irrational
An irrational illness is not understood by the medical profession.
As it is un-diagnosable, it is seen as both untreatable and incurable.
Irrational illness is seen as psychological rather than mental.
Mental illness is diagnosed by a psychiatrist.
Psychological illness is seen as irrational behaviour and referred to a psychologist.
Unfortunately, psychology is the study of mental behaviour, so it treats it as a mental problem rather than an emotional problem.
Emotion is seen as irrational with the logic of a rational professional physician.