I'm having this on-and-off cough for a few weeks, and I'm really worried. I had an x-ray, and they saw some infection-like patches on my right lung, but my COVID test was negative. I took some meds like amoxicillin, montelukast, and clarithromycin for five days, then Allegram and Abphyllin SR for another week. The second x-ray looked okay, but I still have cough. Some days it's not so bad, but other days, I've got this chest congestion with white phlegm that's sometimes frothy, sometimes thick. My doctor wants me to keep taking Allegram and Abphyllin for three more weeks. I'm anxious about whether this is enough or if I should do more. Is using a nebulizer something I should consider?