hello there..i read your history and understand you are suffering from pain in your arm and i would be happy to help you out
you have not mentioned history of trauma.you should understand
rotator cuff involves a group of muscles involved in movement and stabilisation of the shoulder joint and tear there is pretty much common
if the tear is minor,i would recommend you to rest,take analgesics like
ibuprofen twice daily after food or use
aceclofenac plus thiocolchicoside tablet twice daily for 5 to 7 days.. and apply warm cloth compresses gently over the area and apply
diclofenac gel over there.
if it is not relieved the doctor will give you steroid injection into the joint and you can start doing small
physical therapy exercises once pain gently subsides
major tear,if any,will be treated surgically ,that too open or key hole depending on you and the hospital.
Hope it helps and cleared your doubts.take care and wishing you a speedy recovery.good day