This syndrome is know and 'walking corpse' syndrome or 'zombie' syndrome. The victim beliefs that he or she is dead, dying and/or lost organs. This disorder tends to exist with people who have depression and schizophrenia. The symptoms manifest through a combination of these other underlying issues.
A world filled with anxiety, fear and constant worry, the patient's issues interfere with their daily lives. They curl up and hide away from the 'dangers' of the outside world.
I did a set of renders for school. My focus was surrounding metal disorders and illnesses.
Created using Blender, Substance Painter, Photoshop, Adobe Fuse, and some assets from the Megascans Libraries.