Six years ago I caught a cold that affected my throat. After four days, I recovered from every symptom except the phlegm in my throat, which has persisted continuously from then to now. It catches my voice and blocks me from singing normally. (And, unless I cough regularly, it builds up over time to the point that my airway can become severely restricted.)
This seems like it would be professionally relevant to a professional singer. Does your wife have any knowledge of such a problem, or how it might be addressed?
As an experiment, try eliminating dairy from your diet. While unrelated to your backstory / being sick, it's known among singers to avoid dairy before a performance to avoid excess phlegm.
I found one mildly locally active antibacterial throat pill that was the only thing that would remove some persistent phlegm like that. I'm not even sure if it was a cure, or just a remedy.
This is off topic, but...
Six years ago I caught a cold that affected my throat. After four days, I recovered from every symptom except the phlegm in my throat, which has persisted continuously from then to now. It catches my voice and blocks me from singing normally. (And, unless I cough regularly, it builds up over time to the point that my airway can become severely restricted.)
This seems like it would be professionally relevant to a professional singer. Does your wife have any knowledge of such a problem, or how it might be addressed?