SO glad the little one is doing better and you have some answers!
I think it’s becoming better known that allergies CAN be the cause of many childhood problems. I remember my brothers having behavior problems after having anything with orange dye in it as children. There’s a Doctor named Dr. Doris Rapp that has lots of good books about allergies in children and how they may be the cause of other ailments. Many of the books were written back in the 1970’s. If I remember correctly, people pooh poohed her ideas. Now they’re finding out that they’re TRUE!