The reason why your system is so sensitive is because of the pathogens. Immune responses create very strong biological changes in the body, so addressing the pathogen problem is primary. There are many supportive things you can do to help the body cope with these stressors, which is important. For instance these problems will cause stressors in all the organ systems, the liver is particularly affected and support is very helpful.
One of the big problems I see is that people make assumptions that they know what they have. Lab tests help us target what we have and then the appropriate therapies can be targeted. For instance treatment for a candida infection is completely different than parasites, and even within the parasite classes there are many types of treatments. So in the long run (both in terms of money and effort) testing will pay off*.
*If you decide to test make sure you do the Metametrix GI Effects test.