Yes it does stink!!! I am in the same boat with pred and BS. But you still have to keep yourself calm and patient. I know because I have been on pred for 16 years. It has brought my childhood Asthma back. I also have OA, hypo-thyroid, I was actually dx 16 years ago with AIM. Most people respond to the meds for AIM, well I didn't and now the diabetes. But I still keep up the hope and not saying I don't have bad days and cry all day. It happens, your mental stabiliity is so out of focus and the depression can take you down. But the best you can do for yourself is eat right, exercise when you have the energy. And most important keep your mind as busy as you can. Also a good support team rather it be family, church, friends that is up to you. But it helps keep me together. Your BS will be effected fasting just as much as eating to much or the wrong things. Work with a nutrionist it will help me. Example I did not know eating banana's and strawberries together is not good. They do not digest well together. Many tricks.
Hope things get better and sometimes I have to listen to my own advise when I am down.
Take care and get informed from your doctor. Your are paying those bills and you need to get answers. Read all you can and make a list of questions for your doctor.