I'm a chocoholic who can't eat chocolate! I was in denial for a long time, ate it and felt ill afterwards.
I am intolerant to wheat and cows dairy, along with meat and fish unless cut very small and cooked in liquid. A lot of processed food causes problems. Can't eat free from bread. So I am condemned to cooking from scratch and eating healthily!
I miss toast.
A nutritionist advised me when planning a meal is to start with loads of veg, then add protein and last of all carbs. She also said also have some protein with every meal and eat little but often.
The good news is that after years of problems with certain foods, I can tolerate small amounts occasionally without instant payback, so eating out is not as stressful as it was.
Just seen your last post, though it seems to have disappeared It might help to seek advice from a nutritionist or dietician. My mum has your condition and saw an NHS dietician several times, while fine tuning her diet.