Sometimes a fasting blood glucose is not enough.

Tyson, you get those late night crashes...that is when you come here and post. Those could be serious LOW sugar events, because the Pred has worn off until you take the next dose in the morning. Night sweats, nightmares, are very common in diabetics having LOWs at night.

Secondly, autoimmune patients, with autoimmune disease can develop type I diabetes anytime, if the disease process begins to attack the pancreas. So while the Pred is stimulating the liver to make more glucose (which is a common side effect) your pancreas may not be working right to take on that effect.

If you looked at the Prograf charts I linked to...you'll see diabetes listed as a serious side effect in many people who reported it.

I think you should ask for an RX for a glucometer and strips and start testing yourself. Sometimes beginning issues only show up at certain times of the day, and may seem normal at others.

Ask for an A1C in your testing you have next. This is an overall average of blood glucose over a period of 2-3 months. It shows elevations, when glucose spikes during the day. It is not in the standard Chem Panel...it is added in extra. May prediabetics show reactive hypoglycemia in glucose tolerance tests, long before elevated fasting levels go up. We are very familiar with this on the PN forum, because that is when PN starts for some people... before severe diabetes occurs. It is called impaired glucose utilization/tolerance.

Since you are interested in the medical field, charting and journaling your journey with MG should be an interesting thing for you to do. It may reveal things your doctors are missing!
People are often very resistant to changing their diet even when frank evidence of harm (blood sugar abberations) is shown to them. This is perhaps your biggest hurdle.

Also extreme dry mouth, and dry eyes too, are signs of another autoimmune problem...Sjogren's syndrome. This is sometimes more difficult to prove with tests. Some people are sero-negative. It is diagnosed with a lip biopsy to see if infiltrates are present in the cells.
We have some patients on PN with this as well...if you search the term on the PN forum you can read their frustrations they have with their own autoimmune issues.