I think I contracted this flu a few weeks ago while visiting a hospital for a routine checkup. That night, I started developing symptoms: a runny nose, lungs full of phlegm, cough, and severe tiredness. The symptoms lasted strongly for over a week, and now, two weeks later, I'm just now getting over them. I tested myself at home for COVID and flu, but those tests came out negative, so I don't know what I had, but it was not pleasant!