Hi Dubious,

It may not be the RSD spreading. Instead it may be that the nerves have regrown (although admittedly nerves regenerate quite fast so this may not be the case). As nerves grow back they are generally sensitive and painful. Similar to patients who have first degree burns and lose their nerve endings they can be in severe pain as the nerves regenerate. If this is the case (and even if it is RSD then desensitisation and trying to use that area as much as possible is important.

I'm not sure if this is any help but it may mean it's not RSD spreading.
and hope it calms down soon.

Rosie xxxx