Every so often I hear of people with your problem. It’s not common, but it’s not unheard of. Sounds like you have a wicked case of it. The problem is, it’s one of those things that doctors can’t figure out, and have no pat answer for, like cancer or heart disease.
I knew a woman years ago who had it with toxins or chemicals in the environment. She spent two years at death’s door, because she reacted to anything. She couldn’t be near groups of people - even their deodorant or cleansers would set it off.
She ended up living in practically a bubble. It was sort of beyond MD’s experience at the time, but they couldn’t argue with the health problems she was dealing with - they were extreme and definately not psychosomatic, and she nearly died from reactions several times.
She started to have some improvement after spending a boatload of money to remove the mercury from her teeth. At the time I knew her she was very happy because that did seem to really help. She did get into some experimental program, and I lost touch with her.
I know it’s hard. I’ve been praying for you.
There’s a naturalist in the area who might know of a dentist who would be willing and able to do that.