Ohhh, I feel so bad for you.
I tore my rotator cuff years ago. I did a bunch of good physical therapy and had a cortisone shot. It took a year of PT (including daily at home), but it seemed to heal.
A decade has passed and for some crazy reason my shoulder has started hurting again...feels like an achy razor blade deep in my right shoulder. I don't know why and I don't know what I'll do if it doesn't go away.
My suggestion is to either get PT or look on youtube for the appropriate exercise info. I found the colored bands were very helpful.