One poster noticed new allergies on taking PPIs, and I noticed relief (at least partial) from some allergies after fundoplication and getting off PPIs.
But to answer your question, yes, there are all sorts of meds that loosen the LES and allow acid to get into the esophagus.
Your food triggers can be termed allergies, thus sayeth my allergist. Keep a food log and note the symptoms. Do this for a month. Then when you have a list of foods or meals that you think are triggers, do challenge testing. Eat a bite, wait 20 minutes, then take 2 bites, wait, then 4 bites, wait and 8 bites, then 16 and stop. Stop any time you get reflux or other symptoms.
But there are multiple components in your trigger foods. For instance one of my problems was not the waffle, it was the maple syrup. I didn't have a problem with corn, but anything made from it. It wasn't the meat, it was the pepper. When you have a list you can do an internet search with several of the terms and the word allergy. My problem turned out to be sulfite, which is in most pre-prepared foods, french fries ....
But as I said, my allergy is much better now that I don't need acid reducers.