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There is a chance that using Benfotiamine may help you.
The metabolic pathway of Flagyl is similar to alcohol. When both are metabolized, they lead to aldehydes which may build up in some people because of a genetic difference. Benfotiamine is a form of thiamine which is needed for the enzymes to perform this action.

You can start with regular old thiamine from a drugstore, which is typically not expensive. Take 200 or 300mg a day in divided doses for a month and see if you notice an improvement. If so you can bump up to the Benfotiamine. This needs to be ordered online ...many of us use iherb.com for it. I use the Doctor's Best brand. This treatment also works for diabetic neuropathy.

Benfotiamine used to be really expensive, but it has now come down in price quite a bit:

http://neurotalk.psychcentral.com/post653193-4.html

There are other threads on our subforum that may help you too.

Flagyl is not the only drug that causes neuropathies.