How Can Peripheral Neuropathy Be Treated?

my husband suffers from perpheal neuropathy(excuse spelling)extremely servere. He visits a pain mgt every month who by the way is abt 82 years old. his meds are white Norco 10/325. Gabapentin does not help at all I see him suffer every day to tears. his meds when they were yellow helped but they told us 20% of pain formular was taken out so pharmacy could sell cheap. My hubby is 74 and wishes he was dead because of this pain. I am thinking of going to duarte city of hope to see if they can help this man. what can I do for him, we have no life for this is killing both of us!