The description of vomiting persistent for 3 days, indicate that, you may be having conditions like liver diseases (hepatitis), Gastric reflux disorder or gastroenteritis.
You may need to consult a doctor, who can examine you and if needed order a few tests, including liver and kidney functions to know the exact cause.
In the mean time, you can take medications like dramamine, and antacids like mylanta or tums to help resolution of your symptoms. In case they are not helping, you may seek help from your doctor for prescription of proper medications like ondansetron, to reduce your symptoms.
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