I don't know what you can do. The mycobacterium family is difficult to eradicate and get rid of in the human body. Their cell walls protect them from most antibiotics. The TB bacteria now are becoming drug resistant across the world.

This is the Wiki on ethambutol:
http://en.wikipedia.org/wiki/Ethambutol

When you have a disease that has little or no treatment then patients are just stuck with having to endure a difficult solution.

This article lists the various things that may prevent neurotoxicity from chemo drugs. Acetyl carnitine, we know about here. Glutathione can be stimulated by NAC supplements.
(n-acetyl-cysteine). I believe the carnitine is given usually in 2000mg doses daily in divided doses for best absorption.

I have very little experience with ethambutol. It is not used much in US.

I'd discuss with your doctor if there is any way to protect you from the toxicity of this drug, that he knows about. Perhaps he can contact someone who knows more about it.

From what I see on PubMed, ethambutol's most likely to affect vision. So report any changes in vision immediately. Some of the papers on PubMed say it is less toxic than some other TB drugs.