What type of scan are you thinking? If its a full body CT scan that would be alot of radiation. Here in Oz the nuclear imaging places will not take you even if you wanted o pay for a scan privately. You need a doctors referral and I think it would be difficult to get a GP to agree to a full body CT in the absence of any other positive signs. If its an MRI that might be different. ( no radiation) but very expensive).

You referred to Glen, I also have a very similar presenting neuropathy to yours and Glens. It started 8 years ago and actually went away for almost 3 full years! Then in Feb and March of 2010 I had surgery and a car accident and it came back at about 50%. Still quite tolerable. Later that year I had the flu twice just one month apart and it really took off. Mine has been chalked down to most likely hormonal or autoimmune.