It sounds lovely and is definitely worth a shot. Would be nice to wear whenever you have a mask on too, I should think - those oils are sanitizing.
Have you tried raw local honey? My daughters, who move around a bit, make sure they start eating that as soon as they relocate. One particularly difficult (in terms of allergies) move to Chicago was cured by honey that had been produced in the city park my eldest moved right next to.
You probably have this in your diet, but just in case, I thought I would mention it.