hello and welcome to the forum,
thank you for your consultation.
from your description i have understood that you are suffering from frozen shoulder
i can understand the pain you are suffering and the disabling effect it is having on you,.
the best treatment for this is physiotherapy
with some pain killers, you can take steroidal injections in the joint by some good orthopedician when the pain is not subsiding .last will be an interventional surgery.
physiotherapy gives a slow result but is the best treatment for the condition,. you need to be patient and continue with the treatment.