Hi. I was diagnosed with what was called "new onset diabetes" induced by steroid treatment post transplant. It developed into Type 2. My doctors (renal and diabetes consultants) refer to it as "steroid induced diabetes".
The bottom line is - whether caused or triggered by steroid treatment (there is debate), if the steroid treatment is less than a couple of months...blood sugar levels can sometimes return to normal a little while after treatment stops. For those stopping steroids after longer periods, it's much more likely that once diabetic..always diabetic. I may be on them for life, but am hoping not to be.
Advice is basic and valid - you will reduce levels by cutting out simple carbs and by getting onto a low carb diet. I stopped my Gliclazide after finding that it was diet which made the real difference. I find my only real spike now is for a few hours after I take my steroids, but it's much lower than it was. So - test with a meter before and a couple of hours after meals to figure out what works for you, get informed about what a low carb diet is (don't hesitate to ask), record the details...and act as if you got diabetes like anyone else. Hopefully, blood sugars can be well controlled with diet, with plenty of fluid and with decreasing doses of steroids. Fingers crossed - take control.