Not sure I am of any help, but I’ve also quite frequently had a symptom that sounds very much like this. It’s the same exact burning feeling you get when you’ve eaten something really spicy…except I haven’t eaten anything spicy.
I’m a bit perplexed by it as well. Maybe it’s just a strange sort of die off, or something to do with the acids the body is producing or acids in the foods?
Sorry I’m not of any help. Just letting you know I’m experiencing something similar as well.