Hi - Wishing you the best. Lemon Mytle would be a great choice, as would Benchmark Thyme, and a host of other anti-fungal oils (I use the Benchmark Thyme myself).

Sorry to not be sure how to integrate this with the COPD machine, but if you find a way to inhale EO's from the machine, excellent. Simply be aware of your body's tolerance to the oil and don't overdo it. Remember also, essential oils have a very short half life - they are out of the body within a couple of hours, so frequent, small doses are best.