OK, that makes sense - well, at least in terms of the testing procedure. Both control saline being normal means the reactions were probably real. Being allergic to every single one, though, wow, that's awful. I was tested like that for 75 or 80 things (few foods, trees, grasses, animals, molds, mites, etc) and was allergic to about 45 if I remember right.
It could be simply lots and lots of allergies, but it could be some more underlying immune abnormalities like you said.
What's the next step?