Parosmia. There's a support sub for this on reddit but I wouldn't recommend browsing it if you're high on anxiety, because it leans the same way as most subs for other poorly understood chronic conditions: My life is over, I cannot cope with this, I'm desperate for a cure, I cannot manage, how could this happen to me.

I have not experienced parosmia personally but I have read some recovery stories as I'm aware of how common it is following covid infection and wanted to be able to help my loved ones. I would second the recommendation to microdose psilocybin if possible. Psilocybin mushrooms can be cultivated at home rather easily and cheaply, but if you cannot do this, I would recommend lion's mane supplements. The non-medical intervention for parosmia is smell retraining. You sniff very strong smelling items while focusing on how they should smell. Typically essential oils are used for this. A combination of all three interventions (psilocybin, lion's mane, smell retraining) would be my personal course of action if I acquired parosmia. The sooner you take action the better your chances.