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What symptoms are you having at present?
Do you have any abdominal pain or fever?
With these symptoms and also with a history of hiatal hernia it would be appropriate for you to consult your doctor and continue with the omeprazole and the zofran as prescribed by your doctor. Also you need to stay hydrated since this is a complication of vomiting. Next your doctor needs to know the cause for your present vomiting. This may be due to many causes and further investigations and diagnostic tests (may be done if the vomiting does not decrease) such as endoscopy may be required.
Now your main concern is to avoid dehydration.Hence you need to make sure that you replace the lost fluids in vomiting. Drink plenty of liquid by taking small, frequent sips. Allow your stomach to settle and avoid eating solid foods for a few hours. Gradually begin to eat bland, easy-to-digest foods. You also need to rest. Make sure that you are urinating normally and that your urine is not dark, which is a sign of dehydration.