I have had this ,on and off, for years. If you google search "burning mouth syndrome" you can find some information. Sometimes I suck on ice cubes for a while and it seems to help. I have also rinsed my mouth and brushed my tongue with baking soda and that seems to help. ( Sugary foods seem to worsen it for me. Anything with cinnamon or ascorbic acid makes it worse too) The other thing that seems to help is to swish my mouth with the liquid antacid, Maalox. I have read that some Doctors are recommending Alpha lipoic acid as helpful but I haven't personally tried it.
It has been very uncomfortable and distracting sometimes and my tongue actually swells a little which makes it brush up against the edges of my teeth and causes more pain. I think I read somewhere that they estimate 1% of the population has this phenomenon. I think some people think it might be some form of neuropathy. It might be more than one cause. Mine started up about 10 or 11 years ago. The first few years was almost constant. It just comes and goes now.
One more thing I have read about is using red pepper sauce on your tongue several times a day which in some way desensitizes the nerves to a degree. I haven't tried this either. The three relief methods I listed above have helped me tolerate the annoying pain.
Hope something will help soon,
Ev
Are you on the interferion treatment?