the main things that ssdi is looking at for peripheral neurpathy in the feet or legs is disruption of gait and station which means basically walking and standing. they are looking at how your pn symptoms interfere with your ability to do work. how it affects your stamina, ability to walk, bend, kneel, balance, climb, squat, crawl, stand, etc. that is what you have to emphasize, your difficulties in those areas. also any medications you take for pain and their affect on your ability to concentrate would also come into play.

From ssdi listing of impairments
11.14 Peripheral neuropathies. With disorganization of motor function as described in 11.04B, in spite of prescribed treatment.

11.04B. Significant and persistent disorganization of motor function in two extremities, resulting in sustained disturbance of gross and dexterous movements, or gait and station (see 11.00C).