Our expert says:
This can be caused by low blood sugar, low blood pressure or can be a warning of an migraine or stroke - rather see your Gp so that he can monitor your blood sugar and check your blood pressure. If you have risk factors for a stroke ( your age >55, high cholesterol, heart problems, family or personal history of stroke, smoking, male, diabetes, obesity) he may need to do a sonar of the arteries in the neck/heartsonar too.
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