First I would get a second opinion from another neurologist to see what their diagnoses would be. I would also ask if your son can be admitted into a epilepsy monitoring unit. He would have a week long EEG and everything would be video taped so the neurologist could also see what is happening.
Have they done blood work to see if he's been ingesting or smoking anything?
We all want to think that our children are perfect, but...
My youngest brother threw seizures when he was younger...turned out that he had been taking sleeping pills...that were prescribed to someone else.
I'm NOT saying that this is what is happening to your son!
I'm just asking if they have looked into the possibility of an allergic reaction to something he's ingested.
It is also quite possible that you have no idea what is going on inside his head...he could be very depressed about something...most teens are, but hide it as well as possible.
Anxiety and depression can cause all sorts of nasty symptoms that we don't think are connected.
Sorry if I'm sounding rude or harsh, I am not trying to come across as that, I'm just trying to help you and your son.
The more pieces of the puzzle we have, the bigger the picture will be...and then something can be found.
Is there anything you are missing? Has he been somewhere new? Another country? Near animals or food that he wasn't near before? New detergent?
Try to think of anything "new" since this started.
I know it's hard, but in order to help him, you need to be strong, and have a clear mind.
Let us know if you can think of anything.
My mom was diagnosed with absenteeism seizures many years ago. She would walk into doors, drive off the road...only be a sudden jolt or a scream could she be "brought back" to us. I know it isn't quite the same thing as a full seizure, but it's still just as scary...especially when she was driving!
Turns out she was allergic to her medication for another problem she has.