I can relate to your struggles. My stomach problems used to be so bad I had trouble keeping my weight up and I was limited to what foods I could eat. I tried so many things to try to cure myself including Elimination Diets , parasite cleanses, liver flushes, supplements, etc. I spent so much money on alternative health practitioners and expensive supplements. I remember eliminating gluten, sugar, and dairy from my diet waiting for the awesome health people talked about but that I never happened to me and I thought that maybe I had so many toxins in me that the diet wasn't enough.
It took a while but I finally realized that the more I tried to cure myself the worse I got.
It's hard to explain how I cured myself but I didn't have to eat a special diet or take any supplements. In fact the more food you eliminate from your diet the more sensitive your body gets to it. When I was reintroducing foods like gluten back into my diet it was uncomfortable at first but after a few weeks I was back to normal.
I recommend you read the book "Thou Shalt Not Eat" and "Mind Over Medicine" These books explained why I wasn't getting better even though I was doing what I thought was the right thing.