It's always harder to break out of the habit of emotional eating. Boredom, happiness, sadness can all trigger food cravings. There are chickies on here who have battled emotional eating and have tips and tricks for dealing with it. I'm still working through it -I also tend to eat when bored. One thing that has helped me is to do something, anything, with my hands. It makes me feel more involved in the task at hand and I forget about eating. If you are at work and this is possible, take a 10 minute break and walk around outside. You'll get some exercise and exercise does stimulate the production of hormones that suppress appetite to a degree.
If you MUST eat, then make it count with veggies. They are high volume and low calorie so it's possible to eat quite a bit without making a serious dent in your daily calories. Carrots, especially, are great - I think a bag of baby carrots is about 130 calories total and I don't think you'll get through an entire bag!

How about making a small salad? Take boston/Bibb lettuce (the kind that has cup-like leaves) and wrap some cukes, tomatoes and carrots in it for a snack. All of those have very few calories and lots of nutrition. Plus, the water content in those foods will help give you a sated feeling. Dressing is optional. Eat the veggies "naked" if possible, but add a little dressing if it is unappetizing.
Good luck!