Are ya sure that last one is from COVID-19 and not from a heart attack from something so moe that it kills? In all seriousness, I hope everyone stays safe and healthy. Wash your hands and practice social distancing to limit the spread so that your local hospital won't be overcrowded too quickly. Also, I love your art!
A severe case from the COVID-19 can basically cause you to drown in your own lung fluids. It's penumonia cranked up to 11.
Edit: I think I understand where that last part comes in - the elderly and people with pre-existing heart and lung diseases are more likely to die from complications occuring due to COVID-19. The sudden chest pain is probably the body overworking its immune response to the point the pre-existing illnesses are relapsing.