Not OP, but I've had a couple of pretty awful NDEs, and in my case, at least, while the euphoria fades after a few days to a week, each one genuinely did seem to reset my anxiety baseline to a lower level. Things that had bothered me 7/10 became 5/10, tops, and that has persisted across years. I would be very happy to have not had those experiences in the first place, but the silver lining is real.