I read your query carefully and I am sorry about these new health issue you are having. Regarding the undertaken steps I think that are following the correct procedure. I assume metabolic causes have been excluded by a routine metabolic panel. If your neurologist doesn t think these syncopal episodes are compatible with your seizure disorder or disease of blood vessels taking blood to the brain then the next step is the cardiologist consultation to investigate for a cardiac origin (arrhythmias, valvular or other structural heart disease, orthostatic hypotension etc). If a syncope, cardiac causes are usually the most probable culprit. I hope everything works out for the best.