@rascal1 I have not had a shoulder replacement but I understand being discouraged. After my second knee replacement, I was in a great deal of pain for about 6 - 8 weeks and then it suddenly lifted, almost overnight! My doctor was seeing me more regularly than typical because of the pain. When I went on an appointment after the pain lifted he was so glad and relieved. Before that it hurt so much at times that I actually cried.
Try to not be discouraged -- easier said than done of course. It will get better, I am sure. Until then just take it one day at a time and one of those days, hopefully, the pain will feel much better.
JK