I have read an article recently that said that if you have the virus and survive, you are probably immune. No one knows for how long. One specialist thought months, another thought up to a year, and another thought longer.
There is also one guy proposing that we just give it to everyone, sort of your plan, and get over it, and move on. Downside is that 2 percent or so dies. Maybe more if medical facilities are over full. Especially the sick and old.
I haven't heard that it is especially painful. Just like the flu but you cannot breath. Might not be a bad way to go. And you seem to go pretty fast. Like a week.