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yes you need to phone in sick it definatly sounds as though you have the bug, i had it recently i had no vomiting or diarrhoea just stomach cramps, infection control at my hospital said it seems to be affecting people differently especially those who have a certain amount of immunity.you should not return to work until 48 hours after the last symptom. it is an air borne virus so that could have been long enough in the house to get it or you may have caught it at schoolkeep yourself well hydrated, preferably with something isotonic, dioralyte or lucozade or similar and rest it will really knock it out of you hope you feel better soon :)