This document presents a case study of a 24-year-old woman, pregnant with twins, who came to the hospital at 34 weeks gestation with high blood pressure and other symptoms of Preeclampsia with Severe Features (HELLP Syndrome). Tests confirmed HELLP Syndrome and Diabetes Insipidus. She underwent an emergency C-section under spinal anesthesia and delivered two healthy babies. Post-operatively she had excessive urine output consistent with Diabetes Insipidus, which was successfully treated with nasal vasopressin spray. She recovered well and was discharged on post-operative day 8.