Many people unfortunately continue to have discomfort or severe pain after having the gallbladder removed which is unfortunate. Consider getting your liver and pancreatic enzyme levels checked. Even if you didn't have stones, you might have had sludge which can lodge within the common bile duct and cause continuing problems. If that's a possibility, you may also want to ask the doc to do an MRCP to look for sludge and/or structural changes in the biliary system. In the meantime, you may want to consider following a low fat diet. It can be of help in some cases.
From Wikipedia:
Postcholecystectomy syndrome (PCS) describes the presence of abdominal symptoms after surgical removal of the gallbladder (Cholecystectomy).
Symptoms of postcholecystectomy syndrome may include:
Upset stomach, nausea, and vomiting.
Gas, bloating, and diarrhea.
Persistent pain in the upper right abdomen[1]
Symptoms occur in about 5 to 40 percent of patients who undergo cholycystectomy. [2]
The pain associated with post-cholecystectomy syndrome is usually ascribed to either sphincter of Oddi dysfunction or to post-surgical adhesions [3] .
Approximately 50% of cases are due to biliary causes such as remaining stone, biliary injury, dysmotility and choledococyst. The remaining 50% are due to non-biliary causes. This is because upper abdominal pain and gallstones are both common but are not always related.