Yup, it's been pretty rough. Worse than I'd expected. I felt the symptoms the last week of December but shrugged it off because I never get the flu. Big mistake.
Could hardly get out of bed most of January. Since then I've had enough energy for maybe one real bike ride a week, and pay for it the next day with exhaustion. And I'm much slower and more easily tired during those rides. I just keep stubbornly thinking it'll be fine this ride, or tomorrow, etc.