I have had problems with coughing up phlegm, especially in bed. This occurred after I started sleeping on a wedge to impede or stop liquid in my lungs. I don't smoke and extremely sensitive to smoke or dust. I am also photosensitive, including exposure to chlorophyll. I compensate for this by using Vitamin C, both in citrus and other fruit, and as a vitamin pill. I have found vitamin C to bevery effective in preventing colds.I tried amoxycillin but that didn't cure the problem. I suspect that mhy sinus is involved, possibly as post-nasal drip, which has been a problem in the past. What is the diagnosis and what can be done about it?