When thinking about obsessive-compulsive disorder or anxiety neurosis in a person that suffers from autoimmunology disease it is worth considering following.
Immunological dysfunction may cause anxiety.
Early childhood bacterial infection may cause anxiety.
Higher levels of cytokines that we can find in people with autoimmunological diseases such as Crohn's disease, may cause anxiety.
Sources:
https://www.moleculeralabs.com/anxiety-that-will-not-go-away/
https://autoimmune.org/anxiety/
https://www.valeriusmedical.com/blog/autoimmune-disease-and-mental-health
https://spokojwglowie.pl/nerwica-lekowa-co-to-jak-pomoc/