--that involve a farily rapid onset and progression, and can involve more than the small, unmyelinated fibers:

http://neuromuscular.wustl.edu/nothe...etes.htm#acute

True difficulties in motor function do imply some larger fiber involvement (all motor nerve are myelinated large fiber).

But, as the other posters mentioned, you may be co-morbid--it's possible that other factors beyond diabetes are contributing to the neuropathy. This is not all that unusual--once the nerves have been assaulted in one way, they are much more vulnerable to other assaults--the so-called "double crush hypothesis", in which two agents combine to act and increase symptoms to a greater degree than the sum of their parts would imply.

It may be well worth further investigation (and I, too, wonder about the statins being involved).