Nebulizer are great things. I had a dog with lung disease and any sniffle meant we broke out the nebulizer, kept the amount of time she needed to be on oxygen treatments down for sure.
The fine mist helps break down the solid chunks in the lungs when its inhaled. Once the vet gets the culture results back, you can ask if there's a medication you can add to the nebulizer treatments that can help.
I hope you get some good news on the culture and it's something easy to treat. Hope the noodle gets well soon!