I had the same diagnosis as your husband 2 years ago, with the same treatment. I experienced the same symptoms with excess phlegm about 3 weeks in. It was a battle that was really tough. My heart goes out to your husband. Gargling with water and baking soda helped somewhat. Staying hydrated also helped. I will say there is light at the end of the tunnel. Tell him to hang in there. It won’t last forever, although there are times it may feel that way. I am now in total remission with no lingering side effects. I pray it is the same for your husband.