This guy is crappy. Get someone else.
My psychiatrist and therapist some times ask me questions repeatedly, but it's usually to clear up something they are not sure about, or a minor detail that they have forgotten or wonder if has changed. My doctor has to look on the chart to see my medication doses, but generally knows what I am taking at any given time if I'm in session or not.
Diagnosises are important sometimes. I went into this psychiatrist, and first of all he asked me general questions about depression, anxiety, family history of mental and physical illness, abuse history, etc. He asked me what I had been diagnosed with in the past (at this point it was MDD and Panic Disorder, but I had never seen a psychiatrist since I told anyone about my very significant abuse history). I had a therapist that also recognized I dissociated a lot, but I had never been formally diagnosed with a dissociative disorder.
In my opinion, I thought I had MDD, PTSD, a dissociative disorder of some kind and Poly substance abuse history. Basically this was exactly right; later I got diagnosed with HPPD and DID and he also has a possible diagnosis of panic disorder or generalized anxiety disorder. I just found all this out my last visit cause I thought to ask, though I could have at any time. He thinks my anxiety is probably PTSD only, in fact I said that when he brought it up and he agrees, lol... so my point is, you should be able to generally know what condition(s) you have without the doctor having to formally spell it out for you. He readily admits when he is not sure of something (like the panic disorder or GAD thing), even after two years he is not sure. But if you ask, it should be there. It shouldn't be the most important thing, drug therapy is not so clear cut and they should use their personally success and failures with certain patients on certain drugs to know what generally works, and what to try second, etc... Just because you may have BPD and drugs are generally thought to not help, there still may be something that the doctor has seen work.
I have an exceptional doctor, but I ask him about my physical ailments sometimes because he explains it a lot better than my GP does and generally realizes I just ask because I'm curious as fuck and want to understand more deeply than most people care to.
There's no reason for him not to try you out on a basic SSRI at least, and if he's just a therapist he should definitely point you to a psychiatrist. He didn't go to med school.
Good luck.
I got diagnosed as having oppositional defiant disorder as a kid, and it changed the way my family treated me and in hindsight is laughable. Labels can really damage someone on an internal and/or external level It is important to be able to discuss the whys with your doctor and not just take their word on one diagnosis or the other. Of course some mental illness has great denial as one of its symptoms, but generally you'll be able to see how it fits, how it kinda fits, or how it's bullshit. I have a lot of BPD symptoms, and if you don't look past that to the DID + PTSD angle, you might think that was it. But going deeper, it's different. Two sessions is not sufficient to make a definite diagnosis, IMO.