[praptak]

> Unless you have a respirator, there isn't anything you can take to resolve "difficulty breathing".

As a private person you can realistically get an oxygen concentrator. These are simpler and less expensive than ventilators (I am not even sure if an untrained person should operate a ventilator).

I was involved in getting a concentrator for my friend who got a very bad case of covid though not bad enough to get into a hospital. The concentrator got his oxygen saturation level from low eighties (dangerous) to low nineties (still below the norm but less dangerous).

[lorenzhs]

> I am not even sure if an untrained person should operate a ventilator

They should most certainly not. If you want to ruin your day, look up how intubation is done.