what ever you do, I would definitely take a break from any exercise that is causing you pain in that area. Once the pain goes away, start back slowly and work a lot on increasing the strength in your rotators.
Cissus has done wonders for my shoulder, though it was not tentonitis rather a small tear. You might also consider purchasing a TENS/EMS unit and a ultrsound unit. The TENS uses a small electrical current to reduce the pain, and the EMS uses a different frequency to help heal the injury and helping to avoid atrophy in the muscle tissue. The ultrasound helps get blood andnutrients in to the area to speed up recovery. You can find some pretty inexpensive prices on both by searching the internet. If you are going to be doing this for a while, it is best to make an investment in keeping your injuries under control.