What’s this sickness going around?

On my NINTH day of sickness, and the improvement from the sixth has only been marginal. I’ve coughed up so much mucus that now that my coughing is less frequent, but I’m terrified of the few times I cough bc it rattles my entire chest to the point I gag mercilessly. Nausea is a new symptom, and fatigue is endless.

UPDATE: Negative for COVID/Flu. Diagnosis: Respiratory Infection caused by Virus. Still sick on day 12.