I had frozen shoulder through an injury it lasted 18mths. I agree its excrutiating and nothing helped with the pain. Gently using the joint even though it hurts is what finally helped mine improve, stretching it to increase the range of movement and applying cold to it after excercising. I went to a chiropracter for only one session and using the excercises he advised I was able to eventually recover full use of the arm.
It can also be caused by over use too, or a chronic condition such as diabetes or even a stroke. I will get better but also it can recur.. I guess just being careful not to over use a shoulder that has been affected in the past is the best way to avoid a return.
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I spent a fortune on physiotherapy and sure enough, two years later, it was better!!
I've found some exercises on the internet and I'm taking painkillers etc and using voltarol. Does anyone have any other suggestions? And, is it likely to keep occurring? And, if so, can I do anything to prevent it? And, what causes it?