Did Mayo tell you to stop smoking? It is known to make neuropathy worse. I know its hard to do (lung cancer survivor here and am on O2 for COPD) but it sounds like you might need to try anything you can to find some relief. I hope you find some help, have you tried the supplements that are recommended here?

If your lungs are not diffusing and you have right sided heart issues you really need to quit for that reason as well.

judi