Sudden blackout

I had similar episodes and eventually blacked out on a few. It is really dangerous especially if you're alone. It also came with prolonged blocked ears upon onset of the blacking out. I was hospitalised because of this but doctors couldn't really point it to anything after doing all the relevant checks. Was asked to ensure that I sit or lie down once I feel the symptoms so that you don't fall when you black out. Do have a word with your gynae in your next visit.