I had the same sickness in early January - like nothing I ever had before. I assumed it was flu and probably was, but I have had flu a few times before in my adult life and the development of this was different. It started with back and chest pain like I had never felt before, that only lasted for a night and then I woke up with a bad sore throat. Over the next few days I felt like I had a head cold but after about 5 days I developed chills, fever, extreme fatigue (I couldn't get out of bed and was sleeping 18 hours a day) and a rumbling, productive cough. This went on for about 8 days, but I was fatigued and a bit short of breath (chest felt tight) for about three weeks. It seems way too early for COVID, but at the same time I live in a town that has a lot of international tourists that come up here when they are in Toronto. I wish I could get a antibody test too. Chances are great that it wasn't COVID, but I think that they are now discovering it has been out and circulating longer than they thought. Did your illness follow the same pattern? I have had flu before and flu usually comes down fast, like in a few hours, but every flu can be different I guess. 2019/2020 is supposed to be a bad flu season.