From all my research and talking to doctors, the main cause of seizures is the toxin called Ammonia. Most people with lyme have high levels of this toxin and when it's not addressed, it causes all sorts of problems including seizures. When bacteria dies, it turns into Nitrite Oxide which turns into ammonia.
There are supplements a person can take to bind up the ammonia and most probably, the seizures will stop.
If you want some links or articles, let me know and I will add them.
Hope this helps!!
Denise