Why does one eye look smaller than the other and why is it not even with the other eye? (photos)

A couple months ago I woke up and my right eye felt different so I looked in the mirror and noticed my brow was dropping over my eyelid and that the eye looked smaller than the other and that it wasn't even. I saw an opthomologist today n had a cat scan. He said that I don't have silent sinus and the my right orbit was slightly bigger than the other but he said he wasn't going to do anything about it n not even fix my dropping brow. What cldve caused this all of a sudden?