I had frozen shoulder many years ago, but it was temporary. It can be treatable if you have frozen shoulder.
I had been suffering from neck problems for many years. I did have lots of physiotherapy treatments (physical therapy) for many years, but they were not good enough to cure my neck. I had few MRI scans on my neck, but all of the reports said my neck does not have any abnormal conditions, but my consultant suspected that it was an ongoing tissue discomfort in my neck.
About two years ago, I started performing neck exercise regime in my local gym. It eventually helped my neck a lot. I put weight plate onto the back of my neck while my chest lying on flat bench. Then, I moved my head higher and nearly looked at ceiling. Please do not use neck exercise regime, unless you have permission from your doctor and physical therapist, because your MRI report said that you have mild spondylosis in your neck.
It says that it can unavoidably weaken your neck joints, but it can be risky to pressure on your nerve roots. I think your neck might put you into a difficult situation if your pain does not disappear. Maybe it sounds like that you could have fibromyalgia. Seemingly, your neck and back are under pressure. Have you ever tried taking an anti-inflammatory powder called DONA?