Abd Ultrasound after gastric bypass

I had gastric bypass years ago. In the recent past I had reconstruction after weight loss. Approx 6 months ago-afterwards I have had abd pains. The local doctors unaware of effects with taking contrast for abd ultrasound. If most of my stomach isn't attached to my esophagus then drinking 2 quarts of contrast endangers my pouch but it would never go to my old stomach right? Any suggestions appreciated. I did call my surgeon but never heard from them at this moment.

I have had many abdominal studies after RNY. The fizzy part hurts like heck but I did it ONCE. often, the radiologist can get by with making the liquid "thin" But it's totally do-able (NOT PLEASANT). Often doesn't take as much as a non op to get what they need done. There is a clear prep that works much better for me than the banana flavor, and that one was like drinking a glass of water. It does not typcially show the remnant stomach. Only way i have heard to see inside that is actually going in surgically. Diagnostic Laproscopy. Contrast is constipating, so believe them when they say don't skimp on water afterwards.