I have had frozen shoulder, it is not fun at all.
Mine lasted almost two years! I know that seems like a long time and it was too. You usually get it in your dominate shoulder first. Then down the road a couple years it hits the other one. But my left shoulder was not nearly as painful nor did it last as long, thank goodness.
I hated to see sunsets come, for some odd reason as night set in the pain intensified ten fold.
If it is truly "frozen shoulder" what it amounts too is a waiting game. I too did the shots, went to sport medicine docs, thearpy,the whole nine yards. I did lots of research I had options of surgery, but opted to ride it out.