Sudden vomiting and diarrhea can be caused by the following conditions: 1. acute gastroenteritis, you can take Huo Xiang Zheng Qi soft capsules, Huang Lian Su tablets or belladonna tablets for symptomatic treatment, diarrhea or vomiting is serious, you need intravenous fluids. 2. food poisoning can also lead to vomiting and diarrhea, may be the usual eat unclean food, or additive overdose of food. You can take oral haloperidol, enteritis, ampicillin treatment, must pay attention to drink more plain water, timely replenishment of body fluids. Pay attention to your diet and eat more easily digestible food. You can drink millet porridge to help relieve diarrhea, and also pay attention to keeping your abdomen warm and not getting cold. If necessary, you should take an anti-inflammatory drip. You can also take morpholine and montelukast to relieve the symptoms of diarrhea, and if necessary, take safranin to relieve the inflammation of the intestinal tract.