If possible, get thee to an endocrinologist. Doctors may be hacks when it comes to nutrition, but they can often be decent diagnosticians with the help of blood labs, etc.
If I were you, I would live on grass fed bone broth and supplements for awhile while experimenting with one food at a time to log my body's reaction to it. Disclaimer: That's easy for me to say because I have no food allergies or negative reactions to food that I know of except a gag reflex to scallops.
Keeping this journal will certainly help. If only to keep a record of what foods screw up your life.
I have much faith that you'll find a workable relationship for your sensitive body and food. With any luck at all, you'll heal and be able to eat the crap that the rest of us do with impunity. Good luck!
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine