Michele, I believe you are on the right track by adding the NAC, this has mucous thinning properties and is anti inflammatory, among many other benefits. Please research the benefits of serratapeptase enzyme, castor oil packs combined with massage, mullein tea, iodine, essiac tea, garlic. Topically each night you might try a salve of olive or coconut oil, you can thicken with Shea or cocoa butter, but not necessary, add anti fungal, anti microbial essential oils like cinnamon, eucalyptus, tea tree, clove, nutmeg, lemon, but in my practised opinion, oregano oil is the essential and magic ingredient. Apply front and back of the chest should feel warmth penetrating chest. This greatly helped family member also put eo's in vaporiser at night with water in closed room. I am since of the opinion the reason the oregano oil helps the lungs is because it kills the mycoplasma thought to cause the condition. Combined with your NAC working on the biofilm and mucous (hiding place) I would expect even better results. For my family member she also (reluctantly) ate raw garlic clove morning and night, maybe you can try extract or pills, and added turmeric, cayenne, clove 1 tsp ea to her tea. And had significant improvement in a week. Please note oregano oil is very powerful and is usually sold 25% diluted, and I have no experience with contraindications of your stated meds, please research. Best to you.