Hi Val
The effect of diabetes (as I'm sure you know) is to increase your blood glucose levels, not lower them. Untreated, they will simply get higher and higher... This is known as HYPERglycaemia.
When you start on insulin or blood glucose lowering medication, your BGs will get lower. However, because this is 'artificial' lowering (ie not because of the body's natural production/usage of insulin) we can't always get it 100% right. Therefore, you might occasionally suffer from lower blood glucose, known as HYPOglycaemia. The symptoms that are shakiness etc etc as described above.
Hence (as far as I am aware), someone with untreated diabetes would never have a hypo.
LJ