Not myself but an elderly relative in his 80's has had a problem for three weeks now. Struggles to keep food down, though has managed a couple of days without being sick but then sick again and back to square one. When getting out of bed and walking he has difficulty with balance. Other than being weak and wobbly he says he is OK apart from the misery of being sick when he eats anything and lack of appetite. Had the nurse round and nothing obvious wrong. Would norovirus last this long? Will have to seek medical attention again tomorrow if no improvement but just wondered if anybody else had seen or experienced such a protracted sickness bug this winter or whether it could be something else. Thanks.