20 y/o female college student has had abdominal pain for the last two weeks. Som

20 y/o female college student has had abdominal pain for the last two weeks. Som

20 y/o female college student has had abdominal pain for the last two weeks. Some mornings, she has nausea and vomiting, but today, she is here with abdominal cramps and nausea. She has lost 8 pounds while having no appetite. She has been having diarrhea for the last few days. No past medical/surgical History or relevant social history.
Identify the patient’s chief complaint. 
Identify the most appropriate physical exams and diagnostic tests to gather more information about the patient’s condition. Be specific and explain your reasoning. 
Explain how the results would be used to make a diagnosis.