When you have rotator cuff trouble, some bone spurs and Parkinsonism you may need a shoulder replacement. If that’s the problem waiting only worsens it. Waiting is why I’ve had both shoulders replaced in 5 years..

Depends on the pain.
If it frozen shoulder it probably needs a look see by an orthopedic dr. If it hurts worse at night and laying flat makes you see stars but a little pillow under your shoulder blade helps a little, it may be a rotator cuff issue again an issue for the orthopedic dr. The pain and tightness is probably the PD.

I’ve had both shoulders replaced after falls ruptured my rotator cuffs. They have recovered extremely well. However, it’s a long haul to healthy.