Similar experience at the end of December. My daughter got the symptoms a day after me. Both of us had the flu shot. I never get the flu until this weird bout of illness. One day of a severe sore throat, several days of a low grade fever, fatigue, and overall body aches. Cough and wheeze. Recovered in about a week. I would love to get an antibody test.
I have not had the flu for probably 25 years, but in February I had achy muscles, a fever, and short-lived uncontrollable shaking from chills. Went straight to bed. Next morning, felt totally normal. Weird. But since flu would have hit me harder, I figure I might have had Covid-19. Would like to get the antibody test soon.
A relative on mine had symptoms in early Dec and tested negative for the flu. I hand more minor symptoms in early January and we both recovered withing a week and half to two weeks. We both had flu shots, and the relative worked in higher ed and got it after kids came back from Thanksgiving recess.