Also, can the symptoms of parasitic infections of the liver and/or gallbladder MIMIC the symptoms of gallstones, gallbladder disease, or liver congestion?
Yes - read about Fasciola hepatica, Opisthorcis and other flukes involved in liver diseases.
Most gall stones are formed in the small bile ducts in the liver and are collected in the gall bladder. A person keeps forming stones after the gall bladder is removed and they can be gotten out using liver or gall bladder flushes.
I was able to get out parasites from the bile system doing parasite herbs then liver flushes. Look at the Liver Flush Support Forum .