Dark urine and pale stools accompanied by gallstone pain (in the upper right abdomen) where gallstones have been seen on ultrasound is likely to be a blockage of the bile duct by one of the stones. This is usually treated by an invasive procedure called ERCP. If you develop fever then this procedure becomes urgent since infection of a blocked bile duct is an immediately life threatening condition - you must go to hospital immediately if this happens. If ERCP or surgery are truly not an option, you could try ursodeoxycholic acid, a medicine which helps dissolve small stones. Good hydration and avoiding fatty foods is also a good idea.