Hi, I'm so glad this is moving forward and getting so professionalised. I had HPPD for a few years after taking 0.5 tab of MDMA and being put on a ruthless assortment of psychiatric drugs and misdiagnosed with bipolar. I finally gradually stopped all medication and my HPPD stopped. The worst were the novel anti-psychotics. Five years later, I paid the NHS a visit to reassess this completely incorrect diagnosis, and they confirmed that I had never had it, and that I had Complex PTSD, a far more fitting diagnosis. Also, depersonalisation came with my HPPD and is often seen in trauma cases.