While I don't have an answer for your problem,, please consider checking the following.
Please check your pituitary adenoma - size, shape and what treatment you should have. Pituitary tumors can cause Cushing's disease. If a person is on long term Prednisone, they can get Iatrogenic Cushing's (a crushing's type syndrome without the tumor).
Please check your adrenals - which control the production of Cortisol. If the Pituitary and the Adrenals are not "speaking" to each other, there are problems with cortisol levels. Keep track of symptoms and food in a diary - to help determine - truly - if there is a connection and how you feel after eating protein, recovery of symptoms, etc. (Any provider would recommend this first - so you might as well start with this while waiting for an appointment.)
Check your numerous Diabetes labs - inclusive of fasting blood sugar, as well as a glucose tolerance test - to see if there are symptoms, but what is happening with your blood sugars. Possibly consider fingerstick or Dexcom to monitor sugar - to see if you are hypoglycemic with frequent lowering of glucose. Eating protein is good as it stabilizes blood sugar instead of having carbs which are good - but a quick source of energy which can cause a rapid lowering of glucose in the body - possibly producing more symptoms.
Keep track of weight, A1C, C reactive protein, etc.
It can be very frustrating to manage yourself - and trying to find the right provider to assist you.
Hope these suggestions will be helpful. Good luck and feel better.