yes the symptom are very suggestive of rotator cuff tendinosis
or tear . age 55 , night pain and pain on moving shoulder and restriction of certain movements of shoulder . when a doctor evaluates you clinically he can make out weather tendon is just inflamed or torn . if he is in doubt you may be asked to get ultrasound
or MR evaluation of the cuff .if only tendinosis will need to undergo rehabilitation
only but if torn will need to repair and once healed will need rehabilitation .
please dont waste time get examined by a shoulder surgeon and start therapy .
cuff tear can become irrepairable soon often within six to seven months .