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The spaced out feeling that you are describing is due to Lamotrigine withdrawal. This is a common symptom in patients who are taken off Lamotrigine after a long time. Usually, these symptoms are more prominent when the medicine is stopped abruptly, but can occur even in patients with slow withdrawal.
As far as the eye twitching is concerned, that is a sign of stress. In your case, shifting to a different medicine after so many years and your body is not taking it well. This along with the uncomfortable feeling of spaced out is creating tension or stress and causing the twitching,
Try not to worry and continue on Lamotrigine as advised by the nurse. Rest will be clear on EEG.
Hope this information is helpful
All the symptoms that you are describing are mostly due to the change in medication after many years. The eyelid spasms or twitching is involuntary. They do not seem like a seizure, though it is difficult to be 100% sure without an examination and investigation. The fact that you have been symptom free since 12 years of age, also goes towards a strong possibility that these symptoms do not indicate a seizure.
let me opt out, so that a neurologist can help you