<s>[INST] I have had symptom like flu for almost three weeks. It started with very thick sticky phlem from my lungs and severe congestion of nasal sinus . I have coughing constantly. It does not matter what I take the mucus just keeps reproducing. I also have a sore cushy spot on the right side in the roof of my mouth. It feels like a sore or type of ulcer underneath the skin. I had double pneumonia with ARDS about 4 1/2 yrs. ago. I have had the flu and pneumonia vaccine and this is the first time that I have been really sick since then. [/INST] Thanks for your question on Chat Doctor. In my opinion you should first consult pulmonologist and get done chest x-ray and PFT (pulmonary function test). There are two possibilities in your case.1. Pneumonia2. Bronchitis. I don't think its flu. As viral infection is self limiting and does not last for three weeks. So we need to rule out above-mentioned causes first. So consult pulmonologist and discuss all these. </s>