I've been tested positive for Covid on July 30, 2020, but I didn't have any symptoms. They admitted me to the hospital anyway and did all sorts of tests like CBC, kidney, liver, d-dimer, ferritin, and some ECG and chest X-ray, and everything came back normal. I got out after a week and have been quarantining at home for six days now. The past three days, I've been feeling like I have this chest fullness, kind of like gastric issues. I went back to the hospital and got another X-ray, which looks fine. But my Spo2 levels have been always between 93 and 96 since I got home. I'm not really experiencing anything else, but I'm worried about how to improve my Spo2 levels. Can you give me some advice?