It is surely not pleasant experience, I have diabetes and I had frozen shoulder on both sides, almost consecutively. Probably been 4-5 years in total, pain is very annoying - I'm not talking about not being able to wipe your arse, I'm talking unable to sleep, because of pain, in any position. The only good news is, from what I was told, it does not reoccur. It is strange experience to have such intensity pain for such prolonged periods. Probably nastiest for me, was experience of being handicapped, even such simple thing as severely restricted shoulder movements - bring MAJOR impact on everyday life and functions. Oh yeah, and drugs don't work, well at least most of them...