<s>[INST] I am a healthy active 49 year-old woman. About three weeks ago I had what I thought was a mild stomach flu, with nausea and aching but no vomiting. Since then, the nausea has persisted, on and off. I also have burping and my bowel movements are not as regular. I was taking calcium/magnesium supplements and thought that might be the culprit, so I stopped about a week ago, but no improvement. Any idea what this could be? [/INST] As you are 49 years and suffering from a recent onset dyspeptic symptoms, I feel you should have undergone a test called upper GI endoscopy. So consult a specialized general or gastroenterology surgeon. He will look at upper part of your gastrointestinal tract via a small probe with a camera which you have to swallow during test. It is better to do this as soon as possible as your symptoms suggestive of small risk of significant illness. </s>