Have had dry nose with bloody dried mucus, uncomfortable dry throat / mouth sore when eating. Feel sick when I eat then I get diarreah, what's wrong?

A guess. Would be a virus and underlying allergies, that are causing your dry nasal issues and the upset stomach and diarrhea. Try resting, drinking plenty of clear liquids, than slowly increasing your diet to soft foods and then increase to regular foods int he next day or so. If your symptoms persist, then seek medical evaluation. Best wishes.