First, stop and breathe, repeat.
Now - being stressed and busy doesn't mean that you can't be on plan. Don't think of it as a "diet". Think of it as giving your body the life-giving fuel it needs to get you through your stressful times ahead.
Seriously - I FEEL so much better when I eat healthy foods. When life gets tough, eating healthfully is even more important
Surround yourself with quick, easy "go-to" foods that fit your plan. You CAN do this. Value yourself enough to take care of YOU!
I find that I MUST balance my life when things get stressful. I must take time te eat right, exercise and meditate/pray.
So - take care of yourself, first - your body, mind AND spirit will thank you for it.