I believe I can help you with your concern
I am so sorry that your adult son is exhibiting these symptoms, i can imagine how that must distress you.
May I ask what type of therapy has he tried before in the past?
I am so sorry, APD is a very difficult disorder to treat
Also is he aggressive at all? Violent?
Well the best type of treatment for APD is called Cognitive Behavioral Therapy (CBT). CBT has a premise that your symptoms are caused by negative thoughts, so if we change your thought process to be more positive and objective as well, then your symptoms will lessen.
Also some medications of antidepressants and mood stabilizers may help his behavior, but truthfully only therapy can really make a sustained changer for him.
Well there are a few places in the country I could recommend, but I think because he is not violent, a trained CBT therapist would do the job for him. I can recommend someone in your area if you like
Well what is the zip code near him, so that I can look for qualified therapists in the area?
Okay give me a few minutes to compile a list for you. But because you want the best. The McLean Hospital in Belmont, Massachusetts is considered the best inpatient hospital for resistant personality disorder. They have a great track record of providing CBT and Dialectical Behavioral Therapy (DBT) for treating personality disorder. Not sure about APD because most places that treat those are individual therapists or prison/forensic state hospitals.
So here are two psychologists in your area that treat APD
It is possible there may be other things going on too. The second link I gave you is an expert in testing and evaluation, so she can run psychological assessments on your son to narrow down the diagnoses as well
Another really good hospital that provides treatment and assessment for your son is the Menninger Clinic in Texas
I would start with the therapists near him because his behavior is not totally aggressive just yet and there is a possibility that outpatient CBT therapy can help him right now before this gets more serious and severe
Also this psychologist specializes in testing and evaluation and personality disorders, but he does not say if he specializes in APD. Still he may be worth a shot too
Anytime, I am always happy to help. Is there anything else I can assist you with today?