I thought I had answered your post before, but cannot find my reply.
Anyway, most of what I know about this injury I have tried to put down on the site, and which you may have found already. Here is the link:
It can take weeks for recovery, so you should try to remain optimistic and be patient. A few of the experts suggest a short course of steroids, but most tend not to recommend this. You already read about the B-vitamins, and there is no evidence that it helps but it probably will not hurt.
Hopefully you will recover fully. I would be interested in your recovery, and how long it takes, etc.
I have this injury myself, so I understand your frustration at this point complete. I started this site because there appeared to be a lack of information out there for recently injured people use as a resource.
Let me know if you have any other questions.