Clinical challenge: what do these changes in headache mean?

A 32-year-old woman with a history of headaches since high school was seen by a headache specialist and was initially diagnosed with episodic migraine with aura. Her typical headaches are unilateral above the temple in beats, with sensitivity to light and sound. Headaches are sometimes preceded by a visual aura. Previously, the patient had about 1 migraine a week, treated with sumatriptan. At the beginning of her auras, she underwent magnetic resonance imaging (MRI) of the brain, which was normal.

The patient remained stable for many years, but as a result of a slight car accident in which she had a badlash, a headache developed which did not develop. not gone. The patient noted that this headache was similar to, but lighter than, her usual migraines. The headache is not present in the morning, but begins when it begins to get ready for work and worsens during the day. The patient reported that sumatriptan slightly alleviated these symptoms, but that she had been using it daily for 2 weeks.

The woman consults her doctor and the results of her examination are normal. The patient denies fevers or recent travels. The patient tried steroid-based drugs for a few days, with few results, and asked her to begin preventive treatment for her migraines.

What would be the next step in managing this patient's headache?