Believe it or not, constipation amoung women is much more common than men. I was once told one can be very rich if he/she invents medicines that to cure women constipation problem or men hair loss problems.
If your constipation is stress related, then you may have (IBS) Irritable bowel syndrome. In my case, I have diarrhea instead of constipation. According to your regular family Dr. The cause of IBS is unknown, and there would be no cure.
The following are my suggestions:
Drinking lots of water. Most americians actually drink less than they need, and are quite often dehydrated at all time.
Think about all the coffee and salty foods and high surger products, which require more water to process then the amount of water we drink.
Try eat smaller meals more frequent instead of large meal. Eat breakfast when you are up, then give your body a chance to exercise.
At last, have a consistant schedule for your #2.
By improved your lifestyle, you will get better in no time.
Have more fibre in your diet, stay away from oil and drink more water... having some hippo exercises (contract and release muscle)... maybe you "JUST" sit too much...