Can you find an allergist/ENT that can also test and treat drug reactions?
I know Im allergic to some of the drugs/ chemicals my own body makes. ( Not such a stretch since most people are allergic to histamine)

If I were in your shoes again, I would detox. For me that means removal of everything I can for at least 3 days... Except clean air and filtered water.

But the step before detoxing is difficult as well: making note of everything you come in contact... Whether food, breath mint, toothpaste, deodorant, laundry detergent ( I cant use them-- have to use non detergent ways to clean) , any chemicals you smell as well... And track your reactions and dates/ times.

You sound like I used to be-- allergic to everything!
For instance for me if I take in too much salt my lips will burn and break out.