What kind of tests?

Hi I had RNY in 2000 and had a "revision" done in MX in July. I say "revision" because the Dr only lengthened my Y channel. He didnt do anything with my pouch or stoma. I went last week to a GI doctor and had an upper GI endosope done. The Dr said my pouch was stretched out but he didnt give me any measurements or anything. My question is what kind of tests can I request that will actually show my anatomy ( size, shape) of my pouch and stoma so I can take the results to a surgeon for a second opinion? What is the Swallow test with the xray that shows the size and shape?