You can do some stool tests that look at parasites. The problem is we all have them and there are tons that can’t be tested for. They can resist a lot of the antifungal treatments and you can’t kill them off. My ND was really infested with them because he used to clean out peoples latrines in korea as a child and he has been consumed with them for life.
If you notice you can’t sleep well with full moons, this could explain everything…