I am going to assume by now you spoke with your neuro concerning these drop attacks.

The vagus nerve COULD be implicated. Your case is extremely complex and in no way can any one suggest a solid etiology for what is going on with you on the forum and in fact, it will take a good number of really smart, motivated specialists working together to solve this.

The reason I bring up the Vagus nerve, is you had a car accident and the Vagus nerve could have been injured. It is also called the tenth cranial nerve. It would not be the first thing the docs thought of, unless, for some reason, a real 'light bulb' symptom or group of symptoms went off in their heads. It just went off in mine, so, I think you need to consult with your doctors immediately regarding these drop attacks. (I think zebras when I hear hoof beats, because by the time a person is on this forum every breed of horse is usually ruled out.) This would be a very rare possibility, but without knowing your other symptoms, other than some neuro stuff, that has apparently been very problematic, I think it is worth your researching it on your own and if it applies, presenting your doc with this info.

The vagus nerve controls heart rate, can bring on 'drop episodes' due to a fall in heart rate and no compensatory rise in blood pressure. It innervates sensorially the pharynx and larynx, as well as a portion of the meninges of the brain (headache) among a huge number of other organs. Google vagus nerve for your own information. A drop attack due to a vagal event of this nature in an individual with a history of potential trauma to this nerve, is not a simple faint, and can in rare cases result in asystole. I assume you have seen a cardiologist? I assume you had a tilt table? A tilt with isoproterenol provocation? Stress test?

It would not show up as a seizure. Altho the nerve originates in the brain, it meanders all over the body. It could show up as a combination of a great number of what seem to be totally unrelated symptoms, from inability to swallow, to graying out, to bradycardia, to outer ear pain. It is an incredibly long and wandering nerve (vagus=vagrant). If you saw your doc and complained of all those symptoms you will likely leave with an antipsychotic, because seldom are all the vagal symptoms correlated...a lot of it has to do with our fragmented approach to patient care. I seldom use the wikipedia for a reference, but this time, it is a good place to familiarize yourself with the vagus nerve, so start here. It has a clear layperson's explanation and decent graphics.

http://en.wikipedia.org/wiki/Vagus_nerve

Drop episodes such as you describe are not a minor matter, and I would pursue this if when you google the vagus nerve, any of these symptoms ring a bell. Regardless contact your doc immediately. It may or may not be the vagus nerve, but, a drop attack is not a minor matter.