I am experiencing sudden nausea, stomach cramps with cramping in lower abdomen, appetite changes with increased appetite, including reduced appetite, passing gas, heartburn, abdominal discomfort, diarrhea, tender abdomen, obstipation, bloating or abdomina

No help online : Given the constellation of symptoms you just mentioned, requires good history and physical examination, kindly see your doctor for assessment and treatment plan, good luck

Abdominal symptoms : Sound like irritable bowel syndrome. Almost always it is associated with emotional issues such a traumatic event or stressful event, so psychological support of the patient is a very important part of the patient's care. The diagnosis is often supported when the patient wants unnecessary testing. See a doctor in person.