It is never fun, as a patient, be the one to stump the experts :(
I can understand the history of radiation causing issues with your ocular motility, even decades after the radiation therapy was concluded. This being said, damage to the optic nerve would only be expected to impact your field of vision and, possibly, your visual acuity....not your ocular motility or where your globe sits in your orbit
(sunk in etc)
I do want to stress to you that you are in excellent hand at BPEI. If I lived in Florida and me or a member of my family had an eye problem that is where I would go. If the source of your symptoms can be figured out, they will do it....even if it takes 'em some time.
Don't let this get you down....hopefully things will get better and anyone who doesn't think you are worth being around because of your eye issues you don't need in your life anyway ;-)
Does this make sense to you?
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If you have a chance, drop me a note in 6 months ( you can do this at no charge) and let me know how things are going. Heck, who knows? You might make it into the Ophthalmology textbooks :)