Ask for the SIBO test – small intestine bacterial overgrowth. The diet is strict, but it works. Ask your consultant about the FODMAP diet, developed by Monash University. It’s not easy but I’ve gone from having a hardly functioning digestive system, always worried about going out, unable to travel, to being able to visit India ( on a very restricted diet!), Russia (Russian food is great for me) and many European countries. Good luck!