My B6 was also quite high when initially tested, about 3x the normal range. I was only taking a generic multi-vitamin at the time. My neurologist also claimed it could have been a contributing factor to my sfn.

So I immediately stopped the vitamin, made an effort to avoid foods high in B6 and drank lots of water. When retested 3 months later, I was back within range, at the high end of normal. But unfortunately, the lower B6 level did not provide any symptom relief.

It appears many people diagnosed with neuropathy present with high B6 levels of unknown origin. I think it's a mystery for many patients.