Hello! I read your question and understand your concern. The frontal and temporal headaches you are experiencing seem to be related to a chronic daily headache, which is commonly overlapped with migraine. The foci of gliosis are usually associated to migraine, but we can not exclude a possible radiation vasculitis ( though the doses of radiation are too small in your case). Tinnitus and the pressure in the left ear may be related to a chronic inner ear infection (though the MRI scan has not reporting anything related to this) or a chronic damage of the vestibulocochlear nerve from radiation. A consult with an ENT specialist and an audiogram may be helpful in excluding ear causes fo these symptoms. I recommend you to consult with a neurologist for a careful physical examination. A brain angiography may be necessary to exclude a possible vasculitis related to radiation as the cause of gliosis. Hope to have been helpful! Greetings! Dr. Aida