Just a small input you may want to consider trying.
A Poo Pill. You can do searches online. There are two methods for restoring healhy gut bacteria and both can be done at home with the 'help" of someone close who has a great immune system, diet and lifestyle.
The method most hospitals use is to take faeces from your donor and blend it up in a blender and insert the fluid rectally high up into the intestine through the rectum.
Complicated and involves doctors and hospitals. I know people who have had this done. It works.
I have personally taken a Poop Pill myself by using my husband as a donor.
It worked. I did it three times. I used the freezer to freeze the specimen and make it easier to cope with.
I used empty gelatin capsules and smashed the specimen up inside a plastic bag with a hammer and filled the capsules.
I took two capsules for three days in a row.
I had taken a lot of Albendazole, Ivermectin and moxidectin over a period of three years for my skin parasite
I have no digestion problems after doing this.
I have faith in this method. Do searches on it. I found references to how the human gut needs many types of bacteria including E coli.
Yoghurts and other acidophillus supplements do not address this need.
Not for the faint-hearted, but makes great dinner table conversation. Sorry! :) Best wishes.