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1 Dizzy spell after diarrhea and vomiting as it caused due to dehydration. 2  Stress and anxiety. 3  In high fever. 4  Old age. 5  Weakness after suffering from prolonged illness. 6  Exposure to extreme of cold or heat. 7  Low blood pressure and high blood pressure. 8  Low blood sugar. 9  After heavy menstruation. 10  Meniereâs disease.
Basilar migraine, also known as Bickerstaff syndrome, typically causes dizziness and vertigo prior to a headache. However, this migraine variant may also cause ringing in the ears, slurred speech, loss of balance, syncope, and even loss of consciousness prior to a headache.