Hi there! 2 weeks ago I woke up with a headache and experienced a short bout diarrhea . The headache lasted the remainder of the day but the next day I was fine. 2 weeks on I m experiencing the same thing, except it s lasted for 3 days - headache, nausea, diarrhea plus very achey back, neck and shoulders and a congested nose (blood in mucus ) this time. I m not sure what it could be - mild food poisoning or flu? Any advice gratefully received. Thanks!