The Chinese medicine diet is working for me to stop the crazy bowel symptoms, I hate making food something to not look forward to, as its one joy we can have even when feeling awful. I tried lactose free, gluten free, fiber, you name it, I'd already given up coffee so that wasn't hard for me to not have it on this plan. This plan worked very quickly, within days! Really great to be able to be out in the world a bit without worrying about bowel uncertainty. My hope is once its stabilized I can switch to more normal healthy eating again and just use some of it. Its not horrible, its just different from my normal way of eating, and sometimes hard for me to plan ahead of time what I'm going to eat, but has been worth it (and I don't stick to it 100% but its still working). Have you looked into Dr Boon Lin a cardiologist in London who deals with many long covid people, he has some great videos and interviews. I just discovered him and find him very helpful, and its not about more drugs that don't work, its common sense things you can easily do to reset your metabolism in ways that are pertinent to long covid effects. It really helps me calm down about it all, because like all of us I can get Depressed and desperate to find a solution after almost 2 years of this. I wish you well, hope you find solutions that work for you!