My son had a dizzy spell which is unusual, racing heart and throbbing in the neck and a stomach ache he's 16 should we worry?

Need more info. Would need more information to make a proper assessment. Please see a doctor for evaluation so a complete history and physical examination can be obtained.
Dizziness . Your child need to be checked by a doctor to check his vital signs, especially blood pressure. He also needs his heart checked very carefully, including EKG to check for arrhythmia. His BP pressure needs to be check in three positions: sitting, laying down and standing.

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