You said it’s not GERD or acid reflux. I’ve battled what I believe is laryngoesophageal reflux. It’s possible to have it without the typical reflux symptoms. My biggest symptoms have been hoarseness and cough. Occasionally ill have an acid taste in the morning when I wake up. A couple months ago I had a UTI and had a five day course of cipro. I’ve been taking pre and probiotics for months. I’ve suspected SIBO for a long time. The short course of cipro helped. I just reached out to my doctor since I don’t have insurance at the moment being between jobs. He agreed to a 14 day course of cipro.
Burning in the throat, barring some strange nerve problems would be typical of some form of reflux.