Burning pain below remnant stomach

I will try and make this brief. My wife had bariatric surgery about 2 years ago. At the time, they also took the gall bladder. Earlier this year, she was experiencing pain upon eating and drinking. After 20 days in the hospital, it was determined she had a kinked bile duct. This was repaired and the immediate pain upon eating and drinking subsided. They also looked in her remnant stomach at the time. It was highly inflamed. They put in a stomach tube. We are no longer feeding that way, but are putting meds in for decreased bile production. Now she is experiencing burning pain below the stomach tube area (not around the tube itself) but between the tube and pelvic area. It is like a constant burning she says. Nothing has seemed to help. She has a lot of discharge from her tube, even when we don't use it. The discharge has also began to have a different odor as well. SHe is due to get an endo this Friday and they are supposed to look into her remnant. I was like, why can't they test her gastric fluid for some sign of infection that possibly her current antibiotics are not touching? They don't seem to be concerned about that. She also has a nerve block scheduled next week and an upcoming appointment with Mayo. I am just baffled, as is she, about what is causing this endless burning pain. We are wondering if she perhaps needs the remnant out? Just trying to figure this out. It has been a long, ongoing battle.......