Hi, there and welcome to our PN forum.

I have some questions:
Have you had B12 tested? With that long history of Vegan eating, you may be low in this. You should be above 400pg/ml. If you were tested, do you know your numerical result? Lab ranges still report low levels as normal, and therefore a doctor will not respond to them properly.

Have you had Vit D tested?

I wonder about your cravings.... this usually means something is missing in your diet and the body is trying to make up for it.

Do you eat gluten?

Most of the reports of nitrofurantoin toxicity say it resolves in a year or two... but everyone is different. 2 yrs on it is a long time also, so you may take longer to heal.

In ganglionopathies, eventually the end point nerves atrophy, because the dorsal root ganglion is responsible for sending messages in return for sensory content. It is like a feedback loop. If the ganglions are damaged, eventually the peripheral endings where the testing was done, don't get the returning signals, and stop firing. This has been discovered in some primate research recently.

Here is our thread about the dorsal roots:

http://neurotalk.psychcentral.com/sh...ht=dorsal+root

More on dorsal root testing:
http://neurotalk.psychcentral.com/sh...ht=dorsal+root

Vegan eating can lead to low levels of methionine, zinc, tryptophan as well. So you might want to test for zinc/copper ratio. Some of our members here have been found to be low in copper for some reason. Many vegans also become low in Omega-3 fatty acids. Flax oil and fish oil are examples of these.