Some things I turn to: probiotics, fermented foods like sauerkraut, bone broth, plenty of clean water. Helpful supplements could include L-glutamine, chlorophylls, digestive enzymes until you're feeling better.
bromelain is the best take for glutening as it is known. if you can take a few either before and iffy meal or after it really reduces the effects. Also things like aloe and bentonite clay help calm your system down.