Diabetes is auto-immune as well.. the most common auto-immune disease in my opinion.
Most of the problems from Diabetes is the food we eat. I also have had high levels of prednizone (still do) and it affected my blood sugar IMMENSELY. I was also on Seroquel for sleep (much better then the addictive bezo's or wake up on the floor and have no idea how you got there Ambien) - this caused my blood sugar to spike as well - double whammy.
HOWEVER, I was eating a sugar rich diet (all kinds of crap refined foods with tons of sugar in them). When I stopped this, guess what!, my blood sugar cratered and no need for any metformin or other crap they give you. I still watch it daily though... just in case.
Be careful with pasta - it's a carb and carbs sometime make diabetes bad, since it's really just a sugar (starch is a complex sugar and generally NOT good for anyone who has crohns or diabetes).
Eat a very carb-less diet. No potatos, no starch, no sugars, etc.. I choose to not eat Wheat, Dairy (well a tiny dairy half/half in my coffee, but a tiny amt), or any complex sugar. I stick to all non-carbohydrate foods - like good veggies, nice grilled chicken or meat, and some "good sugar" fruits. Mono-saccarides are even scary with diabetes - so you might hold off on the natural sugars like oranges, apples, grapes until you blood sugar returns to normal (<100).
Seems to be working for me... Good luck.. remember, as crohn's sufferers, we have a predisposition to all auto-immune diseases. I also suffer from auto-immune hepatitis - which I believe was triggered by food... but it's in control. So, when we get diabetes, it makes sense, since we just are walking immune system disabled people..
That's why I think it makes a lot of sense that the food is some sort of trigger for us, in that our body attacks what it believes is foreign, and food somehow creates these circumstances that our body just can't turn off the immune system, even when the foreign matter is ejected... as watery D...