It takes time to bring you body to full functionality after that covid damage, cells need to be made to replace the damaged ones. Do those breathing excercises and you will be fine in 2 to 3 months
It is true, the father of my best friend was infected with Coronavirus, he is 50 years old. For him this virus was not so fatal, he had high temperature and he lost smell and taste. He was cured two weeks ago but till now he is not feeling very good, he is very weak and cannot eat, he had problems with respirations but in general lines he is ok. We need to take care of our safety, to wear masks in close/public places, guys you can check https://pandemicpal.net/n95-masks-coronavirus-covid-19/ , there you will find more info.