Take them your test results, and start keeping a
log right now of your bowel movements, your pain, your eating habits, stress levels, etc.
In the meantime, try to have a bowelmovent. Get some exercise, light walking, if you can. Eat some fresh fruits and veges. If you are constipated, it will be more difficult for them to tell whats going on. Then with a cleaned out bowel and your log, it will be much easier for your specialist to help you with a diagnosis.