When u use medical terms like migraine and aura, I will assume that they are exactly same as a doctor may use with medical definition. Random use of terms may direct my answer in different direction. It's wiser to get an EEG TEST done and visit the neurologist again. Topiramate is not a bad drug, but for any such medicines dosages may be titrated frequently as per symptoms or recovery claimed by you in any symptoms form. The drug decision by doctor depends on how you describe symptoms to the doctor.