Hi Maddy!
I'm sorry to hear about this pain of yours, specially if it really affects your daily life. I agree with bhups1 that this maybe a case of frozen shoulder, however, an exact cause should be pinpointed. Causes may include arthritis from overwork, primary muscle and nerve problems (myopathy and neuropathy), or connective tissue diseases. I suggest you discuss with your doctor regarding these and don't end your visit without you having a reasonable explanation.
I suggest also to continue your exercises since if these are stopped, the stiffness might progress quickly. The medications would also help in alleviating the pain. Also, ask your doctor about corticosteroid shots through the joint. This treatment has been proven to work for people with your condition.
Hope this helps. Regards and God bless...
Hi, probably it is frozen shoulder due to inflammation, scarring, thickening, and shrinkage of the capsule that surrounds the normal shoulder joint. Any injury to the shoulder can lead to frozen shoulder, including tendonitis, bursitis, and rotator cuff injury. Frozen shoulders occur more frequently in patients with diabetes, chronic inflammatory arthritis of the shoulder, or after chest or breast surgery or autoimmunity. Long-term immobility of the shoulder joint can put people at risk to develop a frozen shoulder.
Although, immobility adds to the problem hence continue mild passive exercises. Please continue diclofen too. Also visit website for more information http://www.mayoclinic.com/health/frozen-shoulder/DS00416/DSECTION=1