I have gotten an allergy test done (it was a finger prick test) and found out I am allergic to dairy, eggs, and almonds. This was a huge discovery for me because I was still eating eggs and almonds almost everyday during my candida diet.
I too have leaky gut and have been cutting these (virtually) completely out of my diet. My symptoms have improved even more doing so.
I have heard it is possible to reintroduce the food you are allergic to when your gut heals, but you should wait at least 6 months before doing so.
I still will randomly eat feta because it doesn’t bother me as much. I think part of it is finding out the problem and the other part is listening to your body.