kidney stones form in the kidney and are passed with urine (pee) via the bladder.
Liver and gallbladder stones pass into the small intestine and go all the way through the small intestine, colon and come out from the rectum.
Low belly pain and regurgitating food can be signs of gallbladder problems but also a bowel obstruction. Bowel obstructions slows down the digestive system it can also cause liver and gallbladder congestion.