My friend  is suffering from vomiting problem. Just after the meal and during brushing teeth, it frequently occurs. Sometimes there is blood in the vomiting. It happened four times in the last three months. Sometimes, there occurs chest pain too. In July, he was done with all the tests, X rays, endoscopy, but everything was normal. He went to a gastroenterologist who suggested him to take tablet 'razo-d' for 14 days without any tests and asked him to avoid tea, coffee and spicy food. Can you please tell the reason behind all this and what can be its cure?? Or any precautions required??