To recommed any further tests and treatment we need to be doubly sure about the white matter
hyperintensities that you have mentioned. There are certain rare diseases which are associated with migraine
and white matter hyperintensities for e.g. CADASIL
. However before jumping to any conclusions you should seek help of neurologist
who can see everything in proper perspective and make a diagnosis for you. You can take second opinion
especially for the MRI. The treatment for migraine would continue in same fashion as of now. Epstein Barr virus infection 20 yrs back may not be of much significance unless it was very severe.