After a lifetime of odd illnesses that didn't seem to have a pattern, and being dx/w FM, RH - you name it, 2 years ago I was finally genetically tested and also had a stool test to see what my body was reacting to. Turned out for me that I am gluten sensitive. Since my test, my daughters and grandchildren have also been tested. We all share one same gene identified as gluten sensitive and all have a different second gluten sensitive gene.
In looking back at family history this should have been obvious to any doctor who took the time to read our history - they don't take the time to do it. From my experience we all have to be our own doctors. So far the only toxins I appear to react to are gluten and tapioca. After being gluten free for about 6 months almost all my health issues disappeared just prior to my turning 60. I still have joint damage caused by years of a hyperactive autoimmune response, but am free of almost all other symptoms that go back to early childhood. Eliminating gluten was the only "drug" I needed.
It is nothing short of miraculous, frankly. My littlest grandson was dx/w Crohns at 14 months - 8 months ago, I am so grateful that at least he knows now and won't have a lifetime of illness.
Nearly all research done on this has been done in Northern European countries which have national health coverage. When the drug companies fund research and there is $ to be made from chronic illness, there is little incentive to find a cure.