I've only ever been allergic to walnuts and I didn't know that until 6 yrs ago when I got allergy tested.
Lately I'm getting that same walnut-type reaction when I eat other foods. Like today I took the kids to Chick-fil-A for lunch. Waffle fries, chicken sandwich & diet coke. Where's the walnuts in that? I've eaten Chick-fil-A for 25 years and never had a problem. The roof of my mouth is all textured and scratchy just like when I have walnuts.
Have you or anyone you know developed food allergies so late in life? I'll be 46 next week.