Avoid sleeping on affected side. Warm up and cool down is a must. Contrast bath---It is a form of treatment shoulder is applied warm water followed by the immediate application of the shoulder with ice water. This procedure is repeated several times, alternating hot and cold. Note that the treatment should always end in the ice water, as heat will induce the body's inflammatory response, while cold helps to decrease inflammation.

Dear Sir I can understand your concern. A detailed clinical examination by an Orthopaedic Shoulder specialist is recommended

Put some ice avoid trying to do any over head activity. See some good surgeon get his opinion followed by good physiotherapists visit.

Consult an upper limb  surgeon specialising is shoulder and arthroscopy, an MRI will be must to reach a diagnosis. But a clinical examination will be needed beforehand.

Go for MRI scan of shoulder,mean while apply hot and cold therapies