I really feel for you, having so many of the same symptoms. Good to feel “less alone” with these issues with the help of support groups. The one thing that has helped the diarrhea issue for me is mixing 1-2 T pure psyllium with warm water every morning and taking a probiotic with that. Have you tried zinc oxide ointment for your bottom? Occasional use of 1% hydrocortisone cream has helped me, too. My biggest problem now is lots of bloating and gas, mostly after dinner, like you. So uncomfortable (and embarrassing!). Good luck on this journey. Hoping and praying for healing solutions.