Besides the stretching, did the physiotherapist recommend any specific exercises for the rotator cuff. This Wiki article
illustrates the basic moves.
The injury needs to be fully healed before you can resume certain movements.
DO NOT do any exercise that causes pain, you're only re-injuring the muscle.
Frankly, this is something beyond my experience and should be seen by a sports medicine specialist.
And be aware for severe rotator cuff tears, surgery may be necessary.