Everyone above has already posted a lot of information, so I don't have much to add. My feet are burning tonight though, and I have/may have/don't know if I have or not-Sjogren's...

You know, I take injectible B12 every week and it seems to help with the burning... You might want to try it. It won't hurt you. It is water soluble and your body just uses it if you need it and eliminates it in urine if it is not needed. A number of people I know are using this for PN pain...

Good luck,
Cathie