Hi. Thanks for your query. Noted the history of sudden wave of mouth watering and feeling like going to vomit, lasts for a minute or so and gone, happened 3 times in the last week, there are no symptoms of stomach ache or others. Such an occurrence occurs classically in a condition called GERD meaning gastroesophageal reflux disease. Another reasons can be severe gastritis but not causing much of the symptoms related or indigestion or stress and anxiety., I would advise you the following. Better to get stated on a PPI like Omeprazole and an antacid when you are on empty stomach. If the problem repeats, get an upper GI endoscopy, X-ray of the abdomen in standing position Ultrasonography of the whole abdomen and further management as per the findings.