Echoing/agreeing with u/emiliegrey. Some random points. Allergy testing isn't accurate. Your elimination diet is the best way to figure things out but you have to reintroduce foods slowly. 5 days between foods that way you aren't "filling your bucket" so to speak. Also I always have to mention this, all those foods you mentioned have corn so if you have a corn allergy, bad news. Yes the rice and bananas even. (And water though that's on the extreme end of things).