if you are a migraineur, then i would nt worry so much....the sinus part sounds like it is serious, and probably of long standing...needs to be treated aggressively.....and i cant figure why a follow up appt wasn't made at the same time as the appt for the mri.....that is how it has been done when i have had imaging work done.....do you have ins? if not that may explain the lack of f/u.
really poor on the part of the doc.....