I had the exact same symptoms for the last 3 years post lap chole. I had all the tests, xrays and Ultrasound done with negative findings. Next stop was the GI Specialist to rule out SOD. However, I stumbled upon this information on how to have a healthy PH Balance . I began a 80/20 intake of Alkaline foods ( primarily veggies and fruits), cut out all medications including my acid reducer ( medications cause for acid!), stopped all artificial sweetners and lo-cal diet foods and coffee.
GUESS WHAT! Within 2 weeks .... NO pain what so ever....No heartburn and for the first time I feel normal and finally pain free.
You might want to look into a PH Balanced diet... I am flabbergasted by all the problems an acidic body causes.
What's happening may be SOD - sphincter of Oddi dysfunction. You should check back with your doc and make sure nothing is happening within your biliary system - like sludge or stones. You may want to discuss having an MRCP done and having your liver and pancreactic enzymes checked. You can read up on SOD here: http://hopkins-gi.nts.jhu.edu/pages/latin/templates/index.cfm?pg=disease1&organ=3&disease=12&lang_id=1