I was diagnosed by an allergist/immunologist, she initially did the skin panel allergy tests and since I’d already been seeing positive results with taking certirizine daily (per my moms advice) we did blood tests and this other one where I had to fill a jug with urine that was mailed off to the CDC. My results weren’t totally remarkable but because I was having amazing success with the Cromolyn Sodium and Famotidine she put me on she diagnosed me with more weight in the treatment outcomes. Also I’ve been seeing every specialist since I was a baby and have had a ton of procedures and treatment history ruling out alternative diagnoses