Wow, she said that? Something I think is damaging is when so-called experts say to patients that something cant be treated, putting the onus on the patient, rather than saying "I don't know." This is a very old doctor confidence trick, forged on the first principle that a patient must believe in his or her doctor. Fine, that has worked to some extent over history, but when they say something negative it can be devastating. To hear a doctor saying it cant be treated because they wont say they don't know how to treat it, is, well, I think it's shameful.
Even a basic therapist can find the origins of someone's symptoms just by asking them to tell their story. It's not always that complicated. It can start with, "I don't know what's wrong with me, I had a great childhood and have a good life, but..."
As for treatment, there are lots of therapies. Some people put DP in an isolated box as though it is untouchable, but I don't believe that. I think everything is connected and nothing is isolated, it just seems that way. An approach that may not seem significant can be just what we need.
Some use meds, like an AD and anti-psychotic, others use talk therapy, writing therapy, somatic therapy, CB therapy or mindfulness. There is no one-hit cure, but there are many ways, piece by piece, to get back to health.