My apologies for the multiple posts @katie215, but I wanted to answer your question: "Does Mayo Clinic do this kind of evaluation and treatment in the US?"

Mayo Clinic in Rochester, Minnesota, has been recognized as the best gastroenterology and GI surgery hospital in the nation by U.S. News & World Report. Each year, Mayo Clinic doctors diagnose and treat more than 9,000 adults and children with inflammatory bowel disease, including Crohn's disease and ulcerative colitis. Mayo Clinic specializes in helping people with severe symptoms that haven't responded well to treatment in the past. You can read all the details here: https://www.mayoclinic.org/departments-centers/gastroenterology-hepatology-digestive-care/sections/overview/ovc-20348241