Stress is the great enemy of weight loss. We can be doing everything right, we can be eating healthy, 5 meals a day, and exercising, but still if we are stressed we won't lose weight.
Chronic stress can damage the immune and other systems. It's linked to the development of insulin resistance as well as hypertension, coronary heart disease, osteoporosis, and other disorders. Basically this stuff is bad for you!
So taking some time for yourself, to work through whatever happens to be causing your stress will not only help you feel better emotionally, but it will make you better physically as well.
Meditation is a great tool to use if you can, yoga works with a lot of breathing exercises that help relieve stress, I use journaling, writing things out can really help you process whats actually going on in your head. Even something as simple as looking at photos of loved ones has been shown to reduce stress levels.