Hi! I had gone through your query and understand your concerns. In the way you describe it might have been a sudden low of blood pressure. If this was the first time it happened and despite this moment you are feeling good or don t have any other symptoms I don t think you should worry. Just to be sure that nothing wrong is going on I suggest you to do some simple tests such as:- complete blood count to exclude an anemia (low number of red blood cells and low Hemoglobin). - Blood sugar to exclude a hypoglicemia. If this tests will be normal and this condition will keep happening I suggest to consult a doctor for further examination. Hope I was able to help you. Take care. Dr.Rovena