Hi..before I was admitted to the hospital I had a consult on the phone with a GI physician that practices in Orlando Florida that was set up by my health insurance nurse. He was the one that thought that SIBO bacterial overgrowth was part of my problem along with Ulcerative Colitis. Hes suggested having my doctor here in my state test me for the problem. He said they do a breath test and run a stool fecalcalprotectin lab, which indeed was positive. He said that the treatment they use is Xifaxan an antibiotic and flagyl, also Uceris ( Budesonide) oral, hydrocortisone enemas and have found that a probiotic called VSL # 3 is good , that can be ordered on Amazon. When I was admitted to the hospital, they had me NPO..nothing by mouth and Intervenous running my entire stay. They did not treat me with the above drugs. They then introduced food back and had me on a low fiber/ low residue diet. They also told told me to take Imodium up to 4 times a day and canasta suppositories once a day a bedtime which is an RX. I also had another CT of my abdomen when I was admitted. This has been a real journey , but the Imodium is somewhat helping slow down things a bit. There is a lot of information on SIBO online. The doctors at the hospital were pretty convinced the long haul covid brought this on.Let me know if I can do anything else to help you.