Oh yes, it could very well be stress related. You could have a little irritated place and when you are stressed, you may be producing more gastric juices which causes the irritated place to hurt. Try eating something bland like crackers or bread when it starts to hurt. This might help.
Oh and try to relax.
Also, try some deep abdominal breathing. Close your eyes. Take a deep breath in very slowly through your nose. Use your abdomen to take in the breath, in other words, your abdomen should pooch out as you are taking the deep breath in. Your chest should rise only MINIMALLY when you are taking in the slow deep breath. After you take it in, hold it about 3 seconds, and then slowly let it out through pursed lips. Try taking 3-4 slow deep breaths in and out like this. Close your eyes. Think of your favorite place - maybe your folks cabin or your favorite hiking place. Visualize yourself at that place. Now take 3-4 more slow deep breaths and imagine how relaxed you'd be if you were there right now. Open your eyes, and concentrate on feeling relaxed. Maybe this simple relaxation exercise will help. if it does, you know the pain is stress related. Also, if it doesn't work the first time, give it two or three tries before you stop. If it helps, keep doing it 2-3 times a day while at work.