About Schubiner, I was checking some notes from Unlearn Your Pain and it seems to me he advocates the pain is physical in the sense that the danger activated brain creates muscular tension, and the nervous system becomes hyper sensitized interpreting these mild tensions as high pain level, aside from creating other strange sensations as heat, itching, numbness, skin sensitivity etc.
I remember a video where he explains stress and trauma stack each other and one day something triggers a reaction where they capture neuropathways to produce pain.