Just want to say you are very courageous and I hope you find a solution soon. I have also been through hell due to mercury amalgam/pesticide poisoning ... was bedridden at one point and chelation/detox only made my gut worse to the point I was getting constant bloating/acid reflux and could not eat many foods (actually I still cannot eat anything slightly acidic or spicy/peppery, not even liquid herbs/homeopathic remedies).
It has been better now, what I found helped was getting mercury and toxins out of the gut. Actually I had just recently started. Used Quicksilver IMD (remove mercury from gut), Enterosgel (remove pathogens from gut incl heavy metals), RestorX (to heal the gut), Xymogen's OptiCleanse GHI (detox and heal the gut).
Not sure if you can tolerate any of these, but hope this helps.
I am still a long way to recovering from Fibromyalgia/CFS, but I do have more energy, strength, mental clarity compared to this time last year. Wish I knew what I knew now sooner instead of listening to the wrong doctors.