As far as nerve healing goes, with out redoing the biopsy, how do we know if the nerve damage is ongoing and perpetual, or irreversible permanent damage, or damage that is healing?

If it is damage that is healing I'm guessing there wouldn't be terrible flares. I'm basing this on any time I've ever healed from something. Injuries get a little better each day unlike the improvements and then setbacks as many of us here seem to experience.