All of the above sounds fairly typical of AC From personal experience, I have experienced all sorts of pain in every imaginable area, from my shoulder to my neck, in my my elbow, sometimes agonising one day then almost gone the next...then back again. Pain differs, sometimes feels like it is in the shoulder joint, sometimes feel like tendon pain in the bicep. I have pain that radiates into the arm, into the shoulder blade and even into my collarbone. I occasionally get 'stoons' of sharp, breathtaking pain in my collar bone area on the same side as the frozen shoulder. (Why it is called such an innocuous name beats me, when it should be called utter agony shoulder. )
I am about seven months on from first symptoms which were constant agonising pain which took over my life lasted about four months but I still had range of movement. Things like sudden arm moves (eg slipped on ice, put arms out to steady myself and almost blacked out) were agonising. Then noticed I could not lift my arm at all, or put it behind my back. Realised it was AC. Now I still have severe limited movement, but only have really bad pain at night and occasionally woken from sleep - but I am still aware of my pain all day every day. Pain and stiffness is still pretty bad on waking then fades as the day goes on. Exercises hurt while I do them but pain doesn't linger or make it worse (still cannot do pendulum swings.)
The bad news...I am having symptoms and pain in my other shoulder, but no sign of the frozen stage as I can still put this arm through a range of motion. I hope it does not develop...
From what I have learned of this condition, we are in it for the long haul.
I had frozen shoulder in both. First one and then the other. The pain was at times unbearable, from a constant ache to a sharp pain like an electrical jolt. I could not get my arm behind my back at all.