Hi there ~
I understand your concerns. Crystal meth
usage may cause an elevation in the blood sugar level. I believe that it can also make your diabetes mellitus
worse by varying your levels of blood sugars. I also think that every individual is different and your blood sugars can vary widely depending on the severity of diabetes you have. It can be dangerous to the point of being fatal with the use of injectable meth. However much you know about diabetes, without kicking the meth habit controlling your diabetes would be difficult to say the least. I hope you consult a psychiatrist
as soon as possible to kick the habit and go to rehab as soon as possible.
I hope this helps. Take care and have a lovely day!