Norovirus - aka the 'winter vomiting bug' - is sweeping the nation, and spreading misery in its wake. But how do you know if you've fallen victim? The grim and extremely infectious virus is characterised by a number of unpleasant symptoms, including vomiting and diarrhoea, and can be severe. Those unlucky enough to catch it may also suffer high temperatures, headaches , and aching limbs. Of course, anyone who has ever suffered a nasty bout of food poisoning will likely note an overlap in