I find it in my health food store though MrsD and many here order it online, it is cheaper online. Most of us use Dr's Best Benfotiamine. It's the B vitamine, thiamine but made different. I think there is much talk about it in the supplements post.

My Mother was told she had shingles but I believe is PN in her back. She tried many things but her symptoms were as yours and when I started benfotiamine for my pn I also put her on it and she too has had amazing results.