Is that an illness by itself? When I search for it, I see phantosmia listed as a symptom. For example Anti-Phospholipid Antibody Syndrome (APS) seems to cause seizures and phantosmia. The same for Burning Mouth Syndrome (BMS) -- links below. [I'm hoping this can be helpful to you, but let me know if you prefer not to chat about this] https://www.neurology.org/doi/10.1212/WNL.96.15_supplement.1533

Phantosmia and psychogenic non-epileptic seizures in a patient with burning mouth syndrome suffering from severe depression - PMC

Burning mouth syndrome (BMS) is a rare but serious medical condition with important psychiatric comorbidity and specific psychological correlates. ...

Well illness vs symptom is an interesting discussion, e.g. is cancer an illness or is it just a symptom of a broken society? That said, so far no doctor was able to diagnose an illness that is causing my phantosmia. Thank you for the hint regarding BMS 🙏!