I somewhat agree–last MayMom and I were sick beyond belief for 2 days. Me first (was visiting her in another state, major NE city) then her. It took a week before I felt normal; her about 3 weeks (she's in her 80's). It came out of nowhere, and was like the flu but wasn't. And we'd both had flu shots, and the last wave of last year's flu was over. I told her last week pretty much what you posted