The abdominal pain, bloating, weight loss, anemia and shortness of breath are symptoms due to many disease. These diseases can be gallstones, appendicitis, metastatic cancer etc. Only abdominal pain has more than 1000 causes. Only thing to do is the differential diagnosis. This can be done by the doctor through different investigations like, blood and urine tests, ultrasound and CT or MRI. It is better to visit a doctor for proper diagnosis and treatment.