Hi MissChessy. I do not know anything about the rotator cuff, but I have severe nerve damage in both of my wrists (Carpal Tunnel) and some times, I hurt from my shoulder down. It keeps me awake/wakes me up at night. I even had to stop carrying a purse, because it was messing with the nerves that run through my arm to my wrist. My hands and arms will tingle, like someone is sticking needles on every inch of that area. I have also picked up things, just to drop them on the floor, because I cannot feel myself holding on to them. Very bad pain, when it is acting up.
Anyway, you may also want to ask the doctor about C.T., if you are experiencing the above.
Hope that you get better soon.
Dorothy