Helende makes a good point (noted in comments )....

Stress does not cause Crohn's disease BUT it absolutely exasperates it. Top reasons I was told that could cause a flare up with your Crohn's symptoms:

Divorce
Break up
Quitting and moving jobs.
Moving your home.

I did the last three all in the same year. Was not feeling so hot. But life goes on and you have to roll with the punches. You can not control all that happens. This is why I believe diet and exercise make a difference. When you work out you work off (for lack of a better way of putting it) the adrenaline that builds up in your body while you are stressed. It is good to do some cardio even if it is just taking a brisk walk. Eating right or things that cause less build up of gases in your intestine will help. It did for me. Also, when you work out you let your mind wander or concentrate on the task at hand. This takes the emphasis off the stress an helps you relax. I have found the diet and preparing my foods to be therapeutic as well. I set aside two days a week to prep foods for my lunches and snacks. I love to come home listen to the news or radio and cook. This might not work for everyone but it helps me unwind, not focus on work, and put my thoughts into my health.

My parting note is I also found out that caring for another (human or pet) brings new meaning and drive into your life. I love my kittens and could not live without them. The greet me in the morning, when I come home, and are always warm and full of life. I do have a boyfriend but he has the ability to speak and does not always greet me at the door.