If you are so unsure, and I know we all go through bad days, maybe being a part for a week or two might not hurt. You say he is understanding, and 9 year olds can certainly understand "mommy needs a vacation." Take a little time for yourself. You don't have to leave town if you don't want to. Obviously if you went to stay at a friends, something is up. I' m sorry you are going though this, but know you are not alone.