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
https://pmc.ncbi.nlm.nih.gov/articles/PMC9174807/
