I have not been as careful as I should about gluten. I tend not to have many visible symptoms--sometimes some diarrhea, but that's about it. So, I suspect it is gluten exposure. Most of the descriptions of mouth problems related to gluten include blisters or ulcers in the mouth. Your message confirms that it might be this more generalized soreness. I must now adopt your "fire breathing dragon" approach. Thank you!
I had mouth soreness, swollen gums, and terrible burning tongue and mouth for 3 years before my DX.
No doctor could explain it. Some said it was "hormonal", some said it was "idiopathic", blah blah blah
It gradually went away after going gluten-free.
If you are gluten-free, maybe it is something else causing it.. like a vitamin C or B-12 or other B vitamin deficiency?
Have you seen a dentist? Could be a dental issue.
Just throwing ideas out there.
I know how painful it is, so I hope you get relief soon.