You may be able to keep your Medicare even if you return to work.
http://www.socialsecurity.gov/disabi...i/extended.htm

Have you been to a neurologist regarding the PN?

If you do attempt to return to work you might want to try these in your boots: http://www.amazon.com/HotHands-Toe-W...6507621&sr=1-5

You probably should not have requested that doc to fill out your paperwork, it probably would have been better to reschedule... It's also not uncommon for docs to write 30 days off work and then renew them while there is a reasonable chance for significant improvement.