Warning: gross oversimplification ahead, but the point is that there is a logic to it, even if it's hard to put into practice!
Well, the first thing is to recognise that the problem is the stress, not the eating. And actually, although in the very short-term eating seems to numb the pain, it is a pretty crap way of dealing with stress! On balance, it just gives you another thing to stress about.
So deal with the sources of stress: can you eliminate any of them? Or give yourself hope of eliminating some? Eg: if your job is a nightmare, are you looking for alternatives? Can you reduce your exposure to the sources of stress? Eg: if you help care for relatives, can you fence off one or two days a week where you will only deal with genuine emergencies?
Reduction is the most important step, but when you've exhausted those possibilities, you need to learn some longer-term and more constructive ways of dealing with unavoidable stress: counselling, meditation, exercise, medication, journaling, group therapy, prayer... I can't know what might do it for you, but there are lots of possibilities to explore.