Hi, welcome to HCM.
There are multiple age related or blood pressure related changes occurs in brain. Altered signal foci on fair are due to same changes. I think MRI
was advised to rule out any intracranial brain lesion.
is due to vascular etiology which 8s extracranial in original. Presently in short mri report is completely within normal limits. No need to worry about that.
You must meet your physician for migrain treatment.
Hope I have answered your query.