It seems unlikely as surely we’d have seen a massive rise in cases sooner?
However my dad - works in an area with a lot of people from China - had something so similar mid January. It started with a terrible head ache and then a fever, followed shortly by a cough. He coughed so much he couldn’t stand up and he was really ill for three weeks and quite unwell for another three - so six weeks in all. He also lost his appetite and lost a stone and a half. He’s never usually ill and has the flu jab every year. If he had that now we’d say it was covid-19 but I guess it probably wasn’t. My mother had it but like my dad. She was more tired and developed a cough but was better within about two weeks. Or so and was never as unwell to begin with.