There is an infrared photo energy therapy that might help your neuropathy, been around for a few years. The problem with you being on morphine is that you cannot take other medications that cause sleepiness. With that said, Lyrica can numb nerve pain, but it makes you sleepy, so you'll need to talk to your doc. Also, an ordinary B vitamin supplement may help your nerves. In addition, could be your knees are getting so bad that surgical intervention may be necessary now. And it goes without saying that cushy and supportive shoes and perhaps a back brace of some kind might help your comfort levels.