Hello, Welcome to icliniq.com. I understand your concern. As per your complaints, the doctor must have done ECG (electrocardiogram), which must have been normal. If an ECG was not done, I would suggest getting an ECG done when you do not have symptoms so that it can be used to compare the one taken when you have some symptoms again. Also, I would suggest getting tested for blood sugar which might be the reason for lightheadedness.
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