bruce:
\\\The thing I can't work out is if my feet etc are numb, why do I get such awful pains in them, especially at night making it impossible to sleep?\\
You do not say as to what is the cause for your peripheral neuropathy as it is often secondary to something else..e.g diabetes or pernicious anaemia.
As you know it affects the nerves of the leg and maybe arms,the larger of which contain nerves to the muscles (motor)and also to sensation (sensory) and amongst those sensory nerves are the nerves of pain (separate from the nerves of touch)
Pain receptors in the skin can also become oversensitized, so that people may feel severe pain (allodynia) from stimuli that are normally painless (for example, some may experience pain from bed sheets draped lightly over the body).
Seems odd I know, but it is a well known symptom of peripheral neuritis.
islasmum has given you one of the ways in which the pain can be treated.