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in brain occurs due to abnormal and excessive electrical discharge in brain areas. When the electrical activity of brain is disturbed one may suffer aura. Individuals show confusion, lightheadedness
, irritability. Your seizures were triggered by aspartame and for long time you didn't experience any seizure. I will advise you to visit your doctor and get EEG of brain done. It may detect abnormal electrical phenomenon happening if any. Second it may be due to some some anxiety
, due to anxiety individual may have features mimicking aura.
So go to your doctor for proper evaluation.
Dr. Seikhoo Bishnoi