What can cause eye shrinkage, pain? One eye bigger and higher that the other. (photos)

My eyes appear tired, the right eye even seems higher and smaller than my right. There is pain around the right eye which feels like a deep ache. I've got my thyroid checked and the test came back normal, I've even had a brain scan and was told I have small lesions on the brain but that was it. I've been to an eye doc and he didn't find anything. What can be causing this and what can I do to make it better. I ask people if they notice my eye difference and they all say no until I take a picture.