I had a frozen shoulder a few weeks after a fall and it was agony, I couldn't sleep, concentrate or manage without painkillers. I had two cortisone injections which made little difference and then had a procedure called Hydrodilation which involves an injection containing saline, steroid and local anaesthetic. It is done to stretch the capsule and although it was pretty uncomfortable when being performed it was miraculous! I was completely better in a very short time and I have not had a problem in the two years since although I make sure to do my physiotherapy as told. I do not know how widely this is available for frozen shoulder but I had a torn rotator cuff, frozen shoulder, tendonitis, bursitis and it saved me