Literally the #2 complaint I see in long haulers on the issue of psychologizing LC, right after all the gaslighting and harmful psychologizing, is how they cannot get any help for mental health exactly because of all the gaslighting and decades of failure psychologizing chronic illness. They cannot find therapists who actually understand this issue, only therapists who perpetuate it.
People with LC are begging for the chance to have actual meaningful support, secondary to actual medical treatment, and they cannot find it because of all the delusional thinking about re-attributing the psychological effects of chronic illness as their cause.
The main failure of de-medicalizing a disease is that everyone suffering from it cannot get any medical help and suffer more as a consequence. The secondary failure is that they are suffering psychologically for it, for which they cannot get any help or support since de-medicalizing is a systemic process that affects all aspects of healthcare.
All this reveals is that psychology is completely unable to assess what it does, while showing the same of medicine. Talk about making two birds completely non-credible with one magical healing crystal.