Yes, I didn't get a notification that I had answers either.
But on the basis that you can subscribe to any question and you can unsubscribe from your own question I am guessing that the facility is not working at the moment.
Just below the question it says "subscribe to question". If you click on it you will normally get emails saying that an answer has been given.
When you ask a question you also get the option (somewhere on the right) to say something along the lines of "had enough answers...unsubscribe" - this means that you won't get emails letting you know people have answered the question (though people still can carry on).