You are doing all you can by flushing every 2 weeks. Hopefully you are using one of the more powerful flush protocols like Hulda Clark e. Keep going and keep flushing because the only alternative is surgery and that route gives you a 60% chance of a cure without a fall-back position.
So what about the "liver damage" your naturopath talks about. This comment is confusing because if you don't have jaundice or high blood-works of bilirubin then the liver still has a good flow, so does the common bile duct and there is a flow of bile into the duodenum. In other words liver bile flow is clear enough. This indicates that the problem is centred on the gallbladder, which as you say may be so choked that it doesn't contract. The serious problem with biliary complaints is pancreatitis where the flow of pancreatic juice is impaired by a gallstone in the common bile duct. This pain associated with this can be acute or chronic and if left untreated can damage the pacreatitis. However the pain profile is different from gallbladder pain. Pancreatic pain starts in the upper abdomen and often spreads to the sides and the back. You may also have nausea, vomiting, fever, yellowish skin, and a racing heartbeat. Gallbladder pain ( Gallstones or infection) is a searing, stabbing pain in the upper abdomen; pain in the back between the shoulder blades; pain under the right shoulder; also nausea, and indigestion.