Health issues with several Fruits/Grains/Legumes

Question

Hi,

I have experimented several time with Apples and Bananas, for instance, and the end result is always minor stomach aches, increased fatigue and a course of acne/cysts. Similar business with Wheat, Corn (+ other grains), Potato, Cacao, Legumes, and possibly Onions (still need to do a proper trial.) Fruit eating in general have been put on hold until I can stabilize my health, by precaution. On the other hand, I haven't noticed any symptoms with Cruciferous Vegetables, Sweet Potato, Carrots, Rutabaga, Beets, Greens and the like. I've stumbled upon different theories and assertions to explain negative response to certain foods listed previously, but nothing seems conclusive enough to help me tailor a restorative diet that would definitely makes me feel alive again.If anyone can provide some pointers, I'd be incredibly grateful. In the meantime, I will continue eating the foods that don't appear to irks my broken immune system?

Please help.

I didn't find the right solution from the Internet.

References:-

https://philosophicalvegan.com/viewtopic.php?t=2537

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Thanks