When I was hospitilized in August they ran a ridiculous amount of test, daily blood tests, usually around 4-6 a day, experimented with meds, tested for all pathogens, viruses, infections including CDIFF and CMV, also did a full colonoscopy and took tissue samples. Literally everything came back negative. All the docs were are very confused and only keep coming back to "it must be the meds."
The kidney surgery is my first major major surgery, but I did have three other minor surgeries prior to this. They do say that I am certainly inflamed from the constant bowel movements, etc, and could take much longer to fully heal once the cause is determined.
Regardless, until a definitive answer is know, the gluten-free diet works for me and is my best option.