blood tests you have had? Have you had a spinal tap done, and if so do you have a copy of the results?
Be sure to know where on the 'testing protocols' you are, or have had done.
Please read the following:
http://www.aafp.org/afp/980215ap/poncelet.html
http://www.lizajane.org/ And
http://www.neuroexam.com/content.php?p=2

These are probably your best outlines of what all should be tested for and why. The LizaJane worksheets are to be used to help YOU keep track of all that's being done [at times it seems very very fast and furious? others slower than turtles] and what else might or might not be tested because of prior test results - It is very hard to get any handle on the pain, let alone what all is happening to you! This stuff will help you get a grasp on the what's and maybe basic whys'....
Hope this helps and keep reading - you mite find something in others' prior posts that strikes a chord with your own instincts....Follow that internal voice of yours...I did, and I do believe it's saved me more than once! - j

BTW, last week while waiting at my NEURO's office for my appt, there was a lady who took her shoes off and was 'resting' them on top...I just said to her: 'Neuropathy?', answer: 'Yes' and I responded: 'Understand' - such a look of relief! At times I feel burning, and the feet are normal, others I feel frozen and they are warm. They can be both warm and BLUE at the same time. I simply try to keep them as comfy as I can and live thru the rest... Actually these days I cannot tell which is better or worse? Hot or Cold? Maybe another day.