Hi. I'm online and happy to answer your question today.
The most useful thing you could do, since these episodes don't last very long, is to get a photograph of your eyes when they are at their worst, and again when everything is back to normal. Make a note of what time each picture was taken and jot down all your symptoms during this event.
Bring these data to an ophthalmologist for his review. It would even be better if you could be examined by an eye surgeon during the acute phase of these attacks.
Since what is happening to you lasts for such a brief time period, your examination by qualified doctors was normal and the events are not suggestive of any common disease, getting to the bottom of what is going on will be difficult.
That being said, if you can do what I have suggested then I think you will have the best possible chance of getting to the bottom things.
I do not think that an EEG would help to figure out what is going on so I' not worry that your neurologist did not do this test when you went to see him.
Does this make sense to you?
I hope this information was helpful for you. But I do work for tips so I want to make sure you are happy before rating me. If you have another question on this or a related issue feel free to fire away. And please let me know if the rating system gives you any troubles. Thanks in advance, Dr. Rick