<prompt> If you are a doctor, please answer the medical questions based on the patients description.My adult son was driving when he suddenly had an attack...stomach area. Not first time. He could not drive, he had terrible pain in abdominal area. It lasted several hours. He would not let me take him to er or doc. He was sweating profusely. He thought it might be an ulcer or that he ate something with milk. He says he is lactose intolerant yet never had this as a kid.  <response>: Hi. Thanks for your query. Noted the history and understood your concerns. Sudden pain in abdomen causing the patient to stop Chat Doctor. Volumes of stomach or sigmoid. Intestinal obstruction. Stone in ureter. This can be diagnosed by the following way:X-ray of the abdomen in standing position. Ultrasonography. Clinical evaluation by a Doctor, preferably a General Surgeon. Tests of blood, stool and urine. All these things will lead to the proper diagnosis and thus proper management. You have to take him to the ER asap to get a proper evaluation and management. 