some exercises you can do to help
http://www.bodyresults.com/E2RotatorCuff.asp
http://www.binghamton.edu/athletics/strength/rota.pdf
Avoid lat pull downs and military presses behind the head, as they place the shoulder in a poor biomechanical position encouraging impingement.
Do not lower the bar or dumbbells below parallel with incline/flat bench press for the aforementioned reason.
Refrain from using too much weight with lateral shoulder raises.
The hallmark signs of a tear are nocturnal pain, loss of strength, and inability to raise the arm overhead.
Many people can function adequately with a torn rotator cuff provided they have a low to moderate pain level. If you do have a tear, depending on expectations, you may want to talk to a surgeon.
You can take ibuprofen to help with pain related to inflamation, other than that, there isn't much you can do.