I had an ileal resection, with removal of the appendix and ileocaecal valve, in October, 1999--and, with rare exceptions, I've had the diarrhea and urgency ever since. Any medications that I've been given either (a) are opiates and keep me from driving when I take them, or (b) block me up miserably (e.g., cholestyramine), with uncomfortable gas bubbles and much worse diarrhea when the drug wears off. No doctor has been able to find a way to alleviate these symptoms.
Other people (as above) seem to have had better luck than I have with remedies after an ileal resection. What the heck--I'm used to the whole syndrome now.