My father had a spinal fusion about a year ago. Now, he suffers from severe peripheral neuropathy in his feet, pain in his legs, and pain at the surgery site. I am searching for ways to help him, but it's hard because he has almost given up. He feels he has tried everything, although I point out all kinds of things he hasn't tried. Anyway, I got him to start taking Brewer's Yeast today. Has anyone had any experience with this or b12. I wish b12 was in the BY, but that's the way it goes. What should I do to help him?