“Sickness” of the body might actually be a healthy body that is simply responding to a sickening environment.
Then a feedback loop is created and the sick bodymind may create more sickening experiences because that is what it knows…until the cycle gets disrupted by doing deeper inquiry into the psychosomatic being that we humans are…

Of course we can argue whether the sickness of the human/bodymind came before the sickness of the environment…getting caught up in that discussion is more of a distraction to the deeper inquiry and this somatic inquiry usually brings up the answers naturally.