Dear Kim
Vitamin B may help your neuropathy. I had real problems with my feet ( fingertips too but not so badly) which stopped getting worse when I started taking vitamin B supplements. May have been coincidental! Check with your oncologist, but extra vitamin B is unlikely to affect anything else so worth a go. A you say it can be serious (although likely to improve after chemo stops, mine did) but you need the additional worry like a hole in the head!
Rant away - it's therapeutic and this network is very good for venting!
Good luck