I hear you, I know too well what you mean.The problem is if I were to limit my food choices to foods I tolerate or foods that do not cause me issues I would starve.
I have two suggestions that you might consider:Mind you some people say gelatin has sulphite and I eat this daily.
1) perhaps having gelatin every other day
and/or
2) adding glutamine to your regimen which in addition to resolving food intolerances can also boost RBC and WBC count. People generally take from 1 to many grams daily, I settled for 300 milligrams daily when I begun taking it regularly back in 2020 and nowadays I take it from 1x to 3x weekly in my morning lemon water.
In my case I found glutamine very beneficial for kidney function.