Stress and weight gain (or lack of weight loss) go hand in hand. Though you may not be aware of it, being under constant stress can increase production of the hormone cortisol
which can cause an increase in appetite as well as extra fat storage around the abdominal region--a big no-no since abdominal fat is linked to diabetes, high cholesterol and other health problems.
Dealing with stress can be as simple as taking a few minutes a day to relax, scheduling a massage as often as you can or cutting down on work hours and increasing play time. Get started with these excellent resources:
Stop Emotional Eating
Exercise & Stress Relief
Relaxation Techniques for Stress Management