 [ Symptoms ] how long should i wait before bringing my 11 yr old with flu symptoms to our family dr it has been 8 days initial symptoms were nausea high fever severe headache loss of appetite and fatigue those lasted about 2 days now she is very tired little appetite sore bellynausea and has a sore throat and cough [ Disease ] since influenza assuming this is what he had only lasts about a week with the worst symptoms the first few days she has exceeded this time she should be examined for a secondary infection at this point