Hello. Thank you for your question.
The scenario you describe it not uncommon. The goal of evaluation syncopal episodes like yours is to capture the symptoms on an ECG or monitor when they occur to make a "symptoms-rhythm" correlation. When this cannot be achieved in the hospital while on telemetry, or on a Holter or an Event monitor with recurring symptoms, the next best intervention is a Loop Recorder.
They are implanted by electrophysiologists, who are cardiologists with advanced training in management of arrhythmias (abnormal heart rhythms). I recommend you ask your cardiologist for a referral to one of these types of cardiologists and ask about a loop recorder.
Very Respectfully,
Dr. S
Base on my experience i would highly recommend first, make a medical récord with all The ekg and test you have.
Then make appointments for both cardillogist/electrophisiologist and neurologist.
Thats not normal. Push until you find an answer