There are many different angles that this needs to be approached:
1. Adequate Testing and Identification of the causes (previous response with testing centers)
2. A good Anti-Parasitic regimen that targets both intestinal and blood borne pathogens that will deal with migration issues when they try to get away from the intestines.
3. Liver/Kidney Herbal support
4. A Good colon cleanser plus home enemas using refined coffee and/or warm filtered water. This is a great product to use at home and worth the investment to keep your intestines moving and purging dead parasites. Implant-O-Rama https://implantorama.com/
You need to be methodical in doing all 4 items above in combination to improve your situation.