I had tested positive for corona on 19th of April 2021. It's going to be a month and I was almost recovering. But a few days back my SPO2 level started fluctuating. My wet cough has converted to dry cough and that's creating a sort of congestion in my chest. I am usually coughing. I have headache and earache now a days. My fevel is not there since 2 weeks now. But why is my SPO2 level falling at this moment? I was recovering.