I want to post this for anyone that has this incredibly frustrating problem.
My wife had daily pain attacks, all in the upper-right quadrant. They lasted between 5 minutes and an hour, and could be incredibly severe. She had already had her gall bladder removed.
All the imaging she had came back as normal.
After substantial effort and MANY gastroenterologists, including one at the Mayo Clinic, we were able to come up with a solution - it is biliary microlithiasis. Essentially, small calcifications in the bile that flow through the common bile duct from the liver get stuck at the Sphincter of Oddi (where the bile duct enters the duodenum).
Imagine a grating where water is flowing through, but small rocks and pebbles are flowing also. Normally, these rocks and pebbles can pass through the grating, but if enough of them come at once, they can stop the water flow.
When this 'sludge' or these calcifications build up behind the Sphincter of Oddi, this causes pressure, and the pressure causes pain. Eventually the pressure pushes the calcifications through, which relieves the pressure.
Essentially you're feeling a gall bladder attack without the gall bladder.
And every GI doctor we went to thought the problem was IBS or nerve pain or just in her head. Incredible. But there is a medication that can make it go away!
We've found the drug Ursodiol to be a godsend. Ursodiol dissolves the calcifications as they pass through the bile duct. It's relatively inexpensive, we haven't noticed any side-effects. And it's like turning on or off a light bulb. If she's not on it - pain attacks extremely frequently. If she's on it, it's about 99% effective in removing the attacks altogether.
Please ask your doctor about this, if you have these symptoms. We are amazed how well it works!