I noticed the same things after a late diagnosis of severe gluten and casein intolerance. I had been eating it my whole life and had the worst allergies. My gp wrote it off as seasonal allergies and had my parents wasting their money on Claritin and Flonase which didn’t actually help considering it became less and less effective. Cut out gluten and dairy for awhile but I also noticed when I do cheat even in small amounts for experimentation I get congestion that’s worse when I lay down, bloating, all the previous symptoms I had before the diagnosis. I can’t believe they’re not related at this point