Testing for Personality Disorders

Hey guys. I was wondering: do any of you know how psychiatrists, psychologists, and/or psychotherapists go about testing people for personality disorders? I've been told that the "official" way for testing for personality disorders is with the MMPI. So now I've taken the MMPI and been told that I don't have a personality disorder, but I'm now being told by my current therapist that my current diagnosis (Major Depressive Disorder, Social Anxiety Disorder, and Generalized Anxiety Disorder) could completely change at any point during therapy and that she could easily decide that I actually do have a personality disorder. And she's not exactly telling me on how she's going about testing and diagnosing me.

It's all a really long story and if you're curious you can read about it in this thread here (where I've posted most of my story):

narcissistic-personality/topic181789.html

Over these last few months I've been posting over in that subsection of the Psychforums without much success in getting answers.

Anyway, for those who took the time to read my whole story (thank you if you did)... I'm curious to know what you think of the whole thing?

How, exactly, do people who work in the mental health care system go about testing patients for personality disorders? Is the MMPI really the only way? And if not, how else could they go about it? I've been reading a lot about psychological experiments and sociological experiments, and been wondering if mental health care professionals would go about conducting mental status examinations on their patients with neither their patients' knowledge nor consent.

And how could they possibly know that a patient is being completely honest with their behavior and/or answers?

PseudoScientist wrote:And how could they possibly know that a patient is being completely honest with their behavior and/or answers?

Prof. Thomas Szasz, one of the prominent figures in the anti-psychiatry movement, emphasised that psychiatrists have no tools to recognize simulation with 100 per cent certainty. You can reasonably ask why, just appealing for so called gesture language which should be known for medical professional in this field. Szasz explains that according to Eugen Bleuler, one of the fathers of the modern psychiatry, simulation attempt is already a sign of metal disorder.
So the psychiatrists have nothing to do but to believe to your words. In that case you can simulate metal illness or on the contrary mental "health". In the second case you just should not to show any positive symptoms of a disorder, i.e. "voices" in schizophrenia case, and also negative symptoms, i.e. the lack of something regarded a sigh of "health". For example, permanent sexual intercourse is considered to be a fundamental mental health symptom in maturity, therefore one "must have" a girlfriend or boyfriend.
But probably it is much more easily to enter than to exit from the psychiatry. I've the strong feeling, this is just a presumption, that all the words a psychiatry labelled person says are not trustworthy, since there are no tools to verify them with 100 per cent certainty.