Best advice on this kind of thing i’ve read was in a roadie magazine and it said:
Having been ill and thinking about starting training again, stop and give it one more day, then start back.
Better to lose another day but be back training close to 100% than coming back too soon and struggling at 80% with your immune system still trying to fight an illness.
Been ill myself this week with an upper respiratory complaint and a funny stomach, infuriating as my new bike arrived this week and i have a nice run of rest days from work so was also looking forward to getting back in the gym too….have just had to accept that this week is a write off, no point making myself more unwell by training when under the weather.
I’ve just kept the fluids trickling in and supplemented with a multi-vit and iron tablet twice a day, eating small amounts and been taking the dogs out twice a day, nothing too strenuous but something, anything to get out of the house and get some fresh air!