I was diagnosed T2 about 12 years ago and a couple of years later with hypothyroid. I had good glucose control until things started to go downhill late 2013. I had frozen shoulder and remarked to the physio that my other joints were seizing up, notably first thing in the morning. He suggested I might have polymyalgia rheumatica and wrote to my doctor. By April 2014 the diagnosis was confirmed and I started the only treatment, prednisolone, a corticosteroid which interferes mightily with glucose control. Soon after, a skin irritation concurrent cleared up, I took no notice. When the steroid dose was reduced it came roaring back. After more tests over a long uncomfortable period of time I was diagnosed with Pemphigoid antibodies at the end of last year. The treatment is also prednisolone which was why it had temporarily cleared up, so I was put back on a high dose at Christmas 2015. Both these ailments are caused by an over active immune system, possibly due to the thyroid problem, and can be triggered by something like flu or a cold and fever, apparently. The pmr is in remission, I am on 10 mg preds for Pemphigoid and Azathioprine also, which is a drug to inhibit the immune system. Only just got on the latter and it takes a while to kick in, so I am pinning my hopes on it because My blood glucose levels are consistently out of range. I hate testing because they are so very bad. I am not going to say how high. I am ashamed, though I know it isn't my fault. Google Polymyalgia rheumatica for information on that. There is a blood test which confirms it. Diabetes, more females than males, and post menopausal, all can be factors. Don't discount statins though, if you take them.