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There are many conditions which can present with similar symptoms. This shortness of breath is typically a symptom of cardiopulmonary dysfunction. However even decreased hemoglobin in the blood may also cause symptoms such as shortness of breath, fatigue, weakness, and temporary loss of consciousness. Therefore I would suggest that you consult your family physician and have investigations such as complete blood count done. Let him/her also examine your heart and lung and if indicated your doctor may suggest additional investigations. Please don't get tensed or worried since anxiety will exacerbate your symptoms.
However if your symptoms increase then please go back to the emergency.