Has anyone had a virus lately that started with sudden extreme fatigue? At work earlier I was fine one minute but the next I felt absolutely drained - it was like someone had pulled the plug out. I’d eaten a good lunch & had drunk nearly a litre of water. When I got home I was shaky, although that passed, and now I’m a bit achey/headachey but none of the usual cold or flu symptoms eg sore throat, cough, runny nose. Do feel a bit queasy though.