My eyes welled with tears after the nasal swab forced itself right up my nose, triggering a sharp sensation. Tears streamed down my face.Very few distinctive sensations – or feelings of extreme discomfort – are as unpleasant as the nasal swab. In fact, stubbing my toe may be far less unbearable than the way Hong Kong’s Covid-19 mass testing has to be administered. I also had to undergo a throat swab. But the nasal one felt like water in my nose going in the wrong direction.I was among early…