Not sure how it works in US but in OZ you can buy a glucose meter in a pharmacy or over the net but we get a script to suit the meter from a doc for the testing strips, the needles can be purchaced over the counter at any pharmacy.
I did try low dose Neurontin at first but it made me feel awfull, so the doc put me on Tramadol SR [slow release] and Endep as well, they worked very well for me, meds are an individual thing, what works for some may not work for others.

The hot/cold sensations is proof that your small fibre nerves are affected as their job is to send messagers of sensation [ hot, cold, pain ] to the brain, if they are damaged they send confused signals which the brain misinterprets.