You've gotten some good information from StridAst. My understanding is that EE can only be diagnosed with a biospy of the esophagus while one is already taking a PPI. Nothing else is specific for EE, because there are other non-allergic conditions that can cause eosinophils in the esophagus (like GERD).
I was diagnosed with EE three years ago in my early 30s. I'd been having symptoms for about five years prior to diagnosis. Mostly it was difficulty swallowing that regularly resulted in food getting completely stuck in my throat mid-meal. My worst episodes would have my throat swelling shut so that food nor water would go down. These episodes would last up to an hour or more at times, and several times I nearly went to the ER (probably should have) but managed to vomit up enough of the food that I could drink enough water to force the rest down. Very painful and scary.
I felt my best when I eliminated all top allergens. But in reality that was extremely hard (especially because I also manage Type 1 diabetes and so try to eat a low-carb diet), and the only foods that I truly seem to react to in a major way (as in can hardly swallow after exposure) are wheat and milk. So at the moment those are what I avoid strictly, and I accept some mild difficulty swallowing and acid reflux most of the time. My allergist did IgE testing and that comes back low-positive for almost every food (my one anaphylactic food allergy comes back very high). Skin testing is negative for most foods and borderline positive for others, again except for my anaphylactic allergy that comes back very positive.
When I react to food with EE it sometimes starts as I'm eating and sometimes starts a few hours later. Reactions usually consist of trouble swallowing (food going slow or needing water to help force it down), pain when swallowing (as if I can feel the food scraping the sides of my throat), acid reflux, stomach pain, sore or irritated throat even when not eating (and my throat just feeling "funny" all the time, like it's swollen), and also some symptoms that seem like mild IgE symptoms like randomly breaking out in hives, mouth burning or tingling, or getting an upset stomach shortly after eating. One thing I do notice is that once I react to something, *everything* is hard to swallow for at least a week, even if they're foods I'm not allergic to.
I have never had raised eosinophils in my blood. I don't think that's common nor necessary with EE. I've also been told that skin tests and IgE blood tests don't necessarily pick up on foods that will trigger EE, because EE reactions do not really involve IgE antibodies and there's no known way to test for EE allergens.
I hope that you are able to get to the bottom of your symptoms. If there's one thing I've become utterly convinced of over the past few years, it's that IgE reactions and anaphylaxis are only one type of food allergy, and in a way they are the simpliest and most straightforward. I think there are a lot of food allergies/reactions, like EE, that medicine is only beginning to understand.