I'm another person who loses weight when I am stressed out. I'm normally on the thin side so it becomes very apparent if I lose even 5 pounds and people start asking if I'm okay. That, of course, sends my mind into a frenzy and I convince myself the reason I have lost weight is due to some wasting disease like cancer. It does not help that I watched my father melt away from cancer when he was 65. And, of course, the more you worry you might have some deadly disease, the more weight you lose as your brain is on high alert and sends your body's metabolism into overdrive. It is downward spiral.
The good news is that as soon as your stress lessens your weight obsession goes away and the pounds miraculously start to reappear. In the meantime, be conscious of how much you are eating. You'll be amazed how little you eat when you are stressed. Supplement your diet with liquid nourishment like Ensure or Boost.
I would be willing to bet that your weight loss is merely due to your new schedule and responsibilities. If in doubt, you may be able to put your mind at ease by checking with your doctor. I have a feeling you are fine.