--they are interesting, and definitely worth second opinions/interpretations.

You do have some disc bulging/protusion in both the cervical and throacic spine, but, while I'm not a doctor (and it wouldn't be a bad idea to get some opinions from our Spinal Disorders forum), my sense is if these were impinging on your cord enough to cause your burning, you'd probably have more widespread symptoms. I think it's more likely this may have to do with blood sugar levels (or some other uncovered etiology).

Generally, random blood sugar testing, or even hemoglobin A1c readings, will only reveal severely dysregulated glucose situations--and the blood sugar readings are notoriously variable depending on time of day, what and when you've eaten, etc. If one of your docs would go for it, I'd recommend a 3 hour or longer glucose tolerance test from a fasting start, with glucose and insulin levels measured before the glucose challenge and then every half-hour. The test is boring, and you feel like a pincushion, but there have been a lot of people who only discovered they had imparied glucose tolerance this way, during the reaction to glucose challenge. (The insulin levels are important for seeing the patterns of your reactons--the insulin rise to the glucose and how severe it is; an overproduction of insulin usually signals insulin resistance even if your glucose levels do not rise to diabetic levels, and this is a precursor to impaired glucose tolerance.)