Can you better describe your symptoms. Your gallbladder would be on your right just below the rib cage but the doctors would order an ultrasound - not a chest x-ray.
Mine was right under my ribcage on the right side around where you might think your liver or gallballder might be. It turned out to be the Glucosamine I was taking for my joints. As soon as I stopped it the pain went away in a few days.