I agree this sound like SOD.
Reta
You may want to look into the possibility of residual stones or sludge in the common bile duct, which can happen with or without a gallbladder being present. An MRCP can be used to check out the status of your biliary system and look for the presence of structural changes and/or the presence of stones/sludge. There is also a condition known as SOD - sphincter of Oddi dysfunction - in which spasms occur in the common bile duct or at the muscular opening to the duodenum of the CBD/pancreatic duct. The pain from this can mimic gallbladder attacks.
The diarrhea can result from unregulated dumping of bile from the CBD into the duodenum. When there's no food to mix with, it will irritate the colon and result in diarrhea and 'explosive' issues.