I've been reading about the burning tongue disorders because i've had this sensation myself. It's been going on for about 4 months. I also noticed that my tongue looks like it has flames going up the sides with deep zig zag cuts along the sides.
I've been under a lot of stress this past year and felt that this condition was related. I went to a chinese doctor. He immediately recognized this condition as having too much fire or being burned out. He recommended a major change in lifestyle, more rest, ...hah... and mild, cool food, no spice. I have noticed that red wine and spicey food definitely aggravates the condition.
I am a healthy 60 yr. old with proper weight, in good shape. After much reading, with references from everything to lack of B12 to thrush, I'm trying chinese herbs specially prescribed. I'll let you know how it works out. :)