Hi Barbara:
This is just an idea you might want to check out. Have you had your thyroid level checked lately? There's something called "burning tongue/mouth syndrome" that is somehow associated with the thyroid level being hypo(hypothyroidism) where your thyroid medicine has to be increased, which is what my GP did when I jumped from taking 60 mg of synthroid to 112 mg in 1 year. I insisted on seeing a thyroid doctor (tomorrow) after reading some things associated with low thyroid, to include the burning tongue/mouth. Just a thought, I'll email you after thyroid dr. visit tomorrow.
Hugs,
julieann