What Tests Can Help To Determine What Is Wrong When

What tests can help to determine what is wrong when a person has a infantile pituitary and Diabetes insipidus, feels like her body and head are spinning, gets dizzy, feeling of a swollen brain, and much pressure in chest, feels numbness in legs and hands, under the nose and side of head, and numbness in area near vagina? she currently takes Desmopressin acetate for the control of water intake and output and we feel this is may causing many of her symptoms, but they can not find anything. Can you pls help us?