the liver is on the right. the pancreas spleen left kidney and large intestine in on the left. just because one doctor was not able to find a reason for his pain/cramping does not mean there is nothing wrong. seeing a different doctor. perhaps a specialist (staring with a gastroenterologist). and some advanced imaging (mri of this area) may be able to ascertain the reason or at least rule out some of the more serious things that this mysterious pain could indicate.
my husband has had cramps that come along all of a sudden since 2004 in the top left abdominal & doctor dont know why. he has a fatty liver that is sparring out and elevated liver enzymes but no one knows what the problem is