<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having some upper abdominal pain, along with melena, nausea, vomiting and headache. Can you please tell me what might be wrong with me?  <response>: Based on the symptoms you described, it looks like you might be suffering from a gastroduodenal ulcer. This is a type of ulcer that is located in the stomach or the first part of your small intestine, also known as the duodenum. 