Q. A 36-year-old woman, with a history of Crohn's disease, presents to the clinic with complaints of recurrent headaches, dizziness, and persistent fatigue for the past two weeks. She also reports episodes of blurred vision and vomiting. She has noticed her hair thinning more than usual, and her skin is noticeably dry. Upon further questioning, she mentions she has been taking an over-the-counter supplement for her persistent acne for the past two months. She denies alcohol use. On examination, her skin appears dry, there is mild alopecia, and sclerae are slightly icteric. Fundoscopy shows papilledema. Based on the patient's clinical features and history, what is the most likely diagnosis?