I was diagnosed with pseudo cushings. It causes me to have abnormally high endogenous cortisol levels, but the source of it is idiopathic. No one knows why in my case as tumors were ruled out and I do not use any steroid meds. I was diagnosed with t2d around the same time. My cortisol is very cyclical, and I was investigated for cyclical cushings initially, but I am apparently pseudo. My blood sugar behaves completely normal when my cortisol is normal, when it’s not I range from prediabetic to diabetic glucose readings. I bombed an oral glucose tolerance test and will have terrible labs when my cortisol is abnormal. Yet like magic when my cortisol regulates, I have normal glucose levels after high carb loads. I think you have very good chance of having your glucose regulate once you taper off the steroids. I hope it all works out for you!