Hi doctor, I went for dinner friday night, and all night had really bad stomach pains and headache. saterday i was sick 3/4 times quite heavily, i havent been sick sunday and today but still have a major headache, blocked nose and chesty cough (not helped by my asthma) ive not long gone just stomached some food, but had to go toilet and my fieces came out like water, it was horrible and getting excruitiating pain in my stomach, can u suggest anything or think why this is?