When I get reflux, it's because of food allergies and intolerances. I have a mild allergy to chicken eggs, but I'm also intolerant to them. If I have just a little in my food, I get the reflux bad. I have several other intolerances, and a few of them will also cause reflux and indigestion.
I don't think my environmental allergies (I've about a dozen) affect my reflux.