Thanks Karen; the DiabetesMine post gave a good summary of this annoying phenomenon. I first experienced frozen shoulder in my early 50's, after living 40+ years with Type-1. I've been pretty fortunate to escape most of the serious complications of diabetes (e.g. eye, kidney and circulatory problems), but have experienced other connective tissue problems such as carpel tunnel. As the shoulder pain got worse, I saw an orthopedic surgeon who diagnosed rotator cuff injury and wanted to operate! Not liking that option, I found another doctor who told me about frozen shoulder and said it would last for a while but would improve over time. Physical therapy did not help me much; I just had to be patient.
When I started to develop symptoms again several years later, I discovered a book called Frozen Shoulder Workbook, by Clair Davies, NCTMB. This guy used Trigger Point Therapy for overcoming pain and regaining range of motion. It's an excellent resource that really worked for me. Once the pain and arm movement limitations start to present, the book explains how to locate remote trigger points in your own body and shows you several methods for massaging them. My frozen shoulder originates below my shoulder blade, and for me it's very effective to self-massage by placing a lacrosse ball against a solid wall, locating the point, and moving back & forth for several minutes. There are other self-massage devices available; all is described in the book. It really works for me!