Yes, with the times we as humans are degenerating. It's not really age, it is human gene being worse and worse combined with the age.
I suspect in 20 years period we might only really be able to eat antialergic food. Similar to high-pure breed cats and dogs.
Maybe try to change your lifestyle. I was (deadly) allergic to anything nuts. I almost died once using a spoon someone used in chinese buffett on peanut sauce in another sauce.
I changed my life drastically (moving from stress of megacity) to living in the woods, now even more close to the nature. First year i was suffering (had a wallnut tree 100m from the window) and after just two years i can even down 200g peanut butter in one session.
Same with guts. i had reflux after just wine glass. Stopped eating junk food with overused oil, now can even enjoy meat sauce from pulled pork without feeling dead for a day.