Sounds like you very well could be right. Stress can effect your intestinal tract. You are talking to one how knows. I face this almost three times a week. Only thing you can do is manage your stress and watch your diet. It this keeps up, I would mention it to your doctor. Could very well be working itself into something I have had for years. Not to worry, just a stomach disorder caused by stress and anxiety. Mine (if I wish) can be controlled by medication. But, I'm on enough med's without adding any more.

That could definitely be why. When I get nervous, same thing happens to me! And apples have that effect on me, regardless... if it doesn't persist, you've probably found the culprit!