Hi Sidney. The symptoms that you are experiencing (early dumping as you said) can occur with a host of other gastrointesinal conditions, like irritable bowel syndrome (IBS) for one. So you may not have gastric dumping syndrome at all. The other important point to note here is that while surgery may be the more likely cause as mentioned above, it can also occur with other conditions like diabetes. This is particularly important because of the rise of type 2 diabetes, and its occurrence even among adolescents. Speak to a doctor as further investigations may be necessary to identify the cause of your symptoms.

Alcohol poisoning?

HI Angela. This is very likely a liver-related problem and it is most probably going to become very serious if he does not get medical attention ASAP. The stomach ache could be gastritis which is common with alcohol excess. The dark urine and white stool indicates a problem with excretion of a toxic product known as bilirubin, a byproduct of blood breakdown. He may also have a pancreas problem. The excessive weight loss is another worrying symptom. He needs to realize that it could be a matter of life and death now. He needs medical attention immediately.