Ah, you run an animal rescue. How fortunate for the animals in your care!
It's a long story but one of the things that I'm trying to sort out right now is if I have a genetic condition that makes it difficult for my body to utilize the B vitamins because I have a high homocysteine level despite taking a very high quality multi-vitamin and a lot of other vitamins for years. The testing for MTHFR is a bit expensive so am going to have to save the funds to do it first. It's explained in the book Dirty Gene's (2018) by Ben Lynch, ND. If I have this condition, my son may have it too.
Now that your glucose levels are well controlled, restoring the nerves in your feet may be possible. If you're interested in exploring this further, the best book I've found so far is A Complete Guide To Understanding, Managing, & Improving Your Peripheral Neuropathy (2017) by Michael Veselak, DC, BCIM, CFMP. Of the 10 books I have surveyed or read over the last couple of years, this one is excellent. If Richard Bernstein was able to reverse all of his diabetic complications, I believe others can too.
Both of these gentlemen have websites.
Fortunately for you, in the US, a small subgroup of chiropractors throughout the country are now treating diabetic peripheral neuropathy with diet, nutritional supplements, and specialized equipment, following taking a thorough health history, exam, and lab work. (Not everyone can be helped, but many can.) That said, if you have MTHFR, just taking the right form of the B vitamins, specifically formulated for those with MTHFR, may be all that's needed.