Ivermectin helps quiet the coughing, as does quercetin.
Based on my own experience, I believe this so-called "covid" is or was being sprayed in chemtrails.
I also believe it's at least part parasitical, or combination of nanoparticles and parasites, that create a protective biofilm around themselves (a biofilm is a very thick sticky mucous type substance), which may be a contributing factor in a loss of oxygen levels. Hospitals are consistently diagnosing it as bacterial pneumonia, but pneumonia has more of a loose mucous that bubbles when you breathe.
The quercetin & Ivermectin seem to break up the biofilm, and breathing improves.