Apple pectin is a great prebiotic and may be helpful in small doses. I used the Amy Myers protocol and had great success. Everyone is different though, so what foods/protocols work for some might not work for others. Best wishes

also research on fecal transplant- sounds like doctors kill off your bad bacteria w powerful antibiotics then you get a fecal transplant from a healthy donor to repopulate your lower intenstines etc w good bacteria. read about it before covid hit but not sure whats come of it

my daughter had so many stomach problems that I hame schooled her. we went to numerous drs and finally found a nutritionist who ordered a blood lab for food intollerences. The top 2 were dairy and gluten, when eliminated those it was like an instantaneous healing and she was back to school with her friends.

The old saying 'we are what we eat' does go a long way I'm afraid. Best I can suggest is to go organic vegan. The chemicals in even fruit and veg (sprayed on the crops before harvest) go a long way to cause many problems. I know we can't eradicate all of them but organic is about as good as you can get. Plus, we have alkaline bodies. Fruit/seeds/nuts/grains/veg is the only way to sustain it. Meat is acidic (along with processed food). So the meat has to go. Suggest set a challenge for say 2 months and see how you feel. Nothing ventured, nothing gained. My household is going vegan for January. I did it last year and lost weight and felt so much better. My meat consumption has dramatically decreased for the remainder of this year and have kept the weight off. If you can't get organic fruit/veg, still go for the standard stuff as it is still much better than including the meat, but go organic where ever possible. You may find you need less to eat. With organic fruit etc, we tend to use 10

cbd oil works great

Herbal Aloe, cut junk sugars. Don’t use high grain bread. Get to naturopath.

Look into a Ketogenic diet