Back when my daughter was diagnosed allergy testing was suggested. She went on an elimination diet to try and identify food "triggers". The elimination diet was avoiding all top allergens and peas. During that time she tried some amino acid formulas to help get extra nutrition without a reaction. And keep in mind that once the eosinophils are activated they can continue causing damage for up to 12 days. She had a follow up scope to see if the diet helped. (It did she was clear of all damage.) Then she challenged each suspect food back into her diet.
Take your time chewing your food. Slurpees are somewhat considered "non-food" and can be very soothing to your throat. Cucumbers, honey, teas, and lettuce were also soothing for her.