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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.
Reasons You Might Get Dizzy. One of the things that changes drastically in pregnancy is how much cardiac output ramps up. This can increase up to 30-50% in pregnancy and starts fairly early on in gestation. As your body adapts to pregnancy, your heart works harder and you have more blood volume to take care of your needs and the needs of your baby.