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This can be caused by lowered oxygen from exertion, but can also be caused by such factors as chemical imbalances, sugar imbalance, hunger, fear, anxiety, shock, sadness or rage, or other factors. It is characterised by an empty sensation in the head, possible nausea, inability to concentrate normally, motion sickness, possible mental numbness, face pains and an open mouth.

A general remedy is Homeopathic Cocculus indicus 30C