Try some Oil of Oregano in a hot bowl of water.
About 6 drops, put a towel over your head to tent and take some deep breaths.
Do not put oil of Oregano in nebulizer, you would never get the smell out.
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RE: Oregano oil
This can be harsh, go slow. I prefer barely simmering water with one or two drops. You will cough your face off the first time you try. I can think a no more effective way to nip an infection in the bud at the first sign of symptoms. Further, it’s very effective against an infection that has settled in.
This oil is very very hot, like a habanero. Be careful with it.