I didn't develop any allergies that caused a reaction until I was 28. Started just being spring then spring and fall. Now it's so bad the right side of my face swells up. It finally drove me to see an allergist and it turns out I'm allergic to 12 things. The worst offender being corn pollen (in Ohio that's a blast)
id recomend seeing an allergist if you hve healthcare, atleast get tested to see what it shows. It didn't miraculously cure me but the shots seem to be working a lot better then any pills did over the years