Hi, I am daily feeling 2-3 seconds blackout atleast 2 times in a day while working on pc or moving or using stairs. Feel heavy head at that time. Then all normal. Yesterday, I was in parked car alone. I felt my car is moving backwards and will hit another car. And i reach to handbreaks. Then i realise it's not happening. But within those 15 mins i felt this for 3 times and i reached for handbreak. While someone was in car, i didn't feel the same. Why is this happening? What can I do to cure it? It started around a week ago.