Hello, Linda.
What type of IBD do you have, Crohn's disease, or ulcerative colitis? Do you have irritable bowel syndrome (IBS), as well? (It is not unusual for IBD patients to have both.) And, what makes you think that the "bulge" above your navel is caused by, or is related to, your IBD?
If you feel that you are constipated, and that your remedy of adding " a lot of" fiber to your diet is resulting in bouts of diarrhea, then, hey; cut back on the amount of until you find a happy medium! Also, drink more water and walk more--these simple lifestyle changes will make a postive difference in your GI health and your all over health.
Please see our symptom checker at
www.healthcentral.com/symptoms/guide-154047-75.html
to read about bowel obstructions.
Be well.
Hope