If it lasts more than a few days, I would be inclined to make an appointment with your Dr. I would suggest that between now and then, jot down anything that may trigger your emotions, because sometimes by doing this it is easier to get to the cause, which means that it can be solved more quickly.
As far as the eating is concerned, try distraction techniques. Perhaps going for a walk is a good place to start - take in the sites, sounds and smells. The extra daylight might be beneficial to your mood - often when autumn/winter sets in, some people suffer a dip in mood. The exercise outdoors provides not only Vitamin D, but also helps those 'feel good' chemicals in our brain.
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