irritable bowel syndrome
"After the donation of a kidney, I have been plagued with a wide variety of non-specified gastrointestinal issues.  The most pressing was a severe problem with vomiting and retching, once I started I couldn't stop.  My abdominal pain was off the charts, and the only thing that would work at that point was a pain shot to quiet things down.  Once I started taking the Bentyl, it's really changed my life for the better."