start icing, Ibuprofen (advil, motrin) atleast 600 mg works, your doctor may prescribe more.
you may be able to avoid surgery if you opt for physical therapy first...your doctor can reccommend a good P.T. and write a prescription for it.
I use to work in a PT office we had many rotator cuff problems, some post surgery some no surgery....go for an MRI see what the doc reccommends and then go from there. Depending on the degree of the injury or pain either PT or surgery should work. Good Luck!