a 43-year-old caucasian woman, previously in good health, presented to the emergency department with headache, blurred vision, and dizziness. symptoms started 3 days ago and progressively worsened. past medical history: hypertension, hypothyroidism, prior cholecystectomy. no known drug allergies. medications: hctz 25 mg daily, diltiazem cd 120 mg daily, and levothyroxine 88 mcg daily. she ran out of all medications 2 weeks ago.