A 61-year-old female patient presents to your clinic due to sudden episodes of left-sided facial pain for the last two days. She states that the pain feels like a 'sharp stabbing ' and is a 9/10 in terms of intensity. The pain lasts about 5-10 seconds and then dissipates rapidly. The pain is often brought on by talking and cold wind. Her past medical history is significant for depression and type 2 DM. What is the diagnosis?