Oh OP I’m sorry you’re going through it, frozen shoulder is awful. I’ve had it in both shoulders, one after the other. Both times it lasted a year or so. It was all in the upper arm for me, I don’t think it’s atypical to feel the pain there, it’s just what it is.
If you’re at frozen stage, I have to say not much helped. For my first, I had 3 steroid injections. They did absolutely zilch. For my second frozen shoulder, I didn’t bother and the progress of the condition was exactly the same.
Things that helped me at frozen stage:
OP, you’ll know what a zinger is. You knock or move your arm in a certain way and that brings on a painful shock in your arm so severe you can’t believe it. Horrid. Just try and keep the arm as still as you can.
Heat didn’t give much relief for me, frozen packs helped soothe it.
I drank lots of alcohol to get me through.
In a while, I can’t say when but it will happen, you’ll notice that the zingers stop. You can move your arm slightly more every day. That’s when you can start gentle physio to ease out the movement. The one where you place your fingers on the edge of a work surface and keep your arms straight while gently bending your body over is great.
After a few weeks/ months this will give you movement back and your pain won’t be half as bad, as your shoulder thaws out.
There are lots of FB support groups for frozen shoulder so try looking them up too.
Sorry I can’t be more positive. Frozen shoulder is a long process ime. There is an op that they do, I’ve heard good things about it?