
What Causes Headache, Dizziness, Nausea And Earache With A History Of Brain Damage?

Seizure possibility should be explored.
Detailed Answer:
I read your question carefully and I understand your concern.
Since lack of blood flow from low blood pressure has been excluded, what must be sought now is the possibility of seizures. Brain damage due to the cardiac arrest may cause the brain to be more prone to seizures. I understand that the CT may result normal but that doesn't exclude damage from that cardiac arrest which now with brain aging may cause additional symptoms, it only sees major lesions. A MRI might show something more but I guess that can't be done due to the pace maker.
So the one possibility to check for seizures is EEG. One simple EEG may not be enough if not done during an episode, prolonged EEG monitoring may be necessary. Only if there is a EEG recording during a passing out episode may there be a certainty it is not a case of seizures.
I remain at your disposal for further questions.

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