Hi there,
I don't think we have diabetes...many people with HH have people with type 1 diabetes in their family (inclusing myself), but then again many people have diabetes regardless.
I was diagnosed for one week with diabetes one time. Had a glucose test and it came back '18' (I don't know if the english have a different measure) which would have been a clear indication of diabetes (normal is 5-7, can vary, over 10 is usually sign of diabetes). I was quite happy there was an answer finally but then one week later a follow up test (measuring an indicator for average glucose level over a longer time period) came back negative.
So, not full on diabetes then, HOWEVER, hormones like cortisol/norepinefrine raise the blood glucose level. I still think (but this is just my personal opinion) it's possible that the production of these hormones can be temporarily raised, (causing sweating, heart rate and blood pressure rise etc) fi by a small neuroendocrine tumor, therefore intermittently raising blood glucose levels, but not long enough to make the averages go up significantly.
This is because there's first of all a range that's deemed normal, and moreover, if the human body encounters surges of certain substances, biofeedback mechanisms will oftentimes cause it to lower baseline production of those substances, anticipating a sudden surge, kind of like when people use steroids, in time they are making less and less testosteron themselves. In theory, I think you could have a situation where glucose is elevated intermittently (causing sweating), the base production is lower (causing even more sweating) and the average still within the normal range (which means no diagnosis, no treatment of condition causing it). But it could also just be a bad reading in the lab of course, who knows...