You are working in a neurology outpatient clinic seeing a patient referred from a local GP clinic. She’s a 38-year-old woman who has been troubled by severe headaches over the past half a year. These headaches are the worse that she’s ever had in her life, describing them as far worse that the compound fracture she sustained four years ago. These headaches tend to happen most nights at around 2am just after she falls asleep. She often paces around her kitchen for a couple of hours and often resorts to bashing her head against the fridge the pain is so bad. When probed further she mentioned that she gets a sense of fullness in her right ear (which is the side that the headache most often occurs on). She remembers having a similar problem a couple of years ago that lasted a few months before resolving on their own.
What medication is most likely to prevent these headaches?