I typically have very reliable seasonal allergies. This year, they weren't bad AT ALL, but today I am incapacitated - headache, sneezing like a champ despite taking Zyrtec, and a horrible stomachache from all the goo. I have no idea to what I am allergic.

GTers who have undergone allergy testing: is it worth it? What was the test like? Did you get a reasonable resolution/treatment from it?