Decisions about taking iron should be made by your doctor.
Iron can accumulate in the body and cause problems.

So ask your doctor that question.

I'd stop the B6 completely for now. Some labs report B6 ranges up to 100 or 125 as normal. If you stop it and retest in 3 months you will see how your supplements are contributing.

There are over 100 causes of peripheral neuropathy.
Here is a list of tests to help identify that:
http://www.questdiagnostics.com/hcp/...eralNeurop.htm

other resources:
http://neurotalk.psychcentral.com/thread121606.html

PN is typically a lifestyle problem. Exposure to something that damaged your nerves (toxins, vaccines, infection, drugs, etc).
A disease process (low thyroid, impaired glucose tolerance leading to and including diabetes, lupus, etc)
Genetic running in families (Charcot Marie Tooth neuropathies).

If this continues, you'll have to put your detective hat on and start looking.

One simple cause you can determine is gluten intolerance. If you have antibodies to the gluten in your food, they sometimes attack the nerves. So going gluten free may show you something along these lines.