My youngest brother maybe when he was 6 or 7 had allergy shots for about a year when he started having bad allergies.

He never had allergies again.

My 2nd youngest brother had pretty bad allergies, which culminated in a 3 month long course of hives one spring/summer, at which point he started allergy shots for about a year - since he was basically allergic to everything inside & outside... and then he just didn't feel like going anymore & didn't... He still has allergies, but they're controlled by allergra or claritin and previously they weren't.

basically... allergies have a tendancy to spiral out of control... (I could bore you with the immunology, but... ), so allergy shots are a good idea, and hopefully they'll work and you won't need all these meds.